OK, here's how this thread is going to be organized. First I'm going to list all the motherboards on this earth based on the i845E, i845G, and i850E chipsets from Intel. I will include 1) the specs of each motherboard as listed on the motherboard makers' web site and 2) links to reviews of these boards as well as people's experience with these boards (i.e. general comments on layout, performance, reliability, etc.). from AnandTech threads as well as other threads around the Internet. Of course you?re welcome to include your own comments and questions about any of these motherboards as well. 
Btw, everyone here is free to send me a personal message with any comments or suggestions about anything.
Abit Motherboards:
i845E chipset: IT7, BD7II and BD7II-RAID
i845G chipset: BG7
i850E chipset: Not listed.
Reviews: Abit BG7 Review @ Tech Report. Abit IT7 Review @ HardOCP. Abit IT7 Review @ Hexus UK
AnandTech Threads: Abit BG7 thread. Abit IT7 thread. Abit AT7/IT7 Thread. Abit BD7-II Thread
Asus Motherboards:
i845E chipset: P4B533
i845G chipset: P4B533-V and P4B533-VM
i850E chipset: P4T533-C
Reviews: P4T533-C Review @ HardwareZone.
AnandTech Threads: P4T533-C Thread
DFI Motherboards:
i845E chipset: NB71-SC, NB73-EA, and NB73-ES. (Click the "products" link on the left-hand side of the page for motherboard models and specs).
i845G chipset: NB35-EC, NB35-EL, NB76-EA, and NB76-EA. (Click the "products" link on the left-hand side of the page for motherboard models and specs).
i850E chipset: Not listed.
Reviews: DFI NB76 Review @ VIAHardware. DFI NB76 Review @ TweakTown.
AnandTech Threads: None yet.
Epox Motherboards:
i845E chipset: 4BEA
i845G chipset: 4G4A and 4G4A+
i850E chipset: Not listed.
Reviews: Epox 4G4A+ Review @ TweakTown. Epox 4G4A+ Review @ OCWorkbench. Epox 4G4A+ Review @ VRZone.
AnandTech Threads: Epox 4G4A+ Thread
Gigabyte Motherboards:
i845E: 8IEXP, 8IEX, 8IE, 8IEMK, and 8IEML-T. (Click the "Pentium 4" link at the top of the page for motherboard models and specs).
i845G: 8IGX, 8IG, 8IGMK, 8IGML-T. (Click the "Pentium 4" link at the top of the page for motherboard models and specs).
i850E chipset: 8IHXP.
Reviews: Gigabyte P4 Titan 533 Review @ AnandTech
AnandTech Threads: Gigabyte 8IEXP Thread. Gigabyte 8IHXP Thread.
Iwill Motherboards:
i845E chipset: Not listed.
i845G chipset: Not listed.
i850E chipset: P4R533-N
Reviews: None yet.
AnandTech Threads: None yet.
MSI Motherboards:
i845E chipset: 845E Max (6566E) and 845E MAX2 LR (6398E)
i845G chipset: 845G Max (6580G) and 845G MAX L (6580G)
i850E chipset: Not listed.
Reviews: MSI 845E MAX2 Review @ Tbreak. MSI 845G Max Review @ AnandTech
AnandTech threads: MSI 845G Max Thread
Soltek Motherboards:
i845E chipset: 85DR2-L, 85DR2-L+, 85DIR2-L, 85DR2-C, and 85DIR2-C. (Click the "products" link at the top left-hand part of the page and then click the "Socket 478" link at the top of the next page for motherboard models and specs).
i845G chipset: 85MR and 85MIR-L (Click the "products" link at the top left-hand part of the page and then click the "Socket 478" link at the top of the next page for motherboard models and specs).
i850E chipset: Not Listed.
Reviews: None yet.
AnandTech Threads: None yet.
Btw, everyone here is free to send me a personal message with any comments or suggestions about anything.
Abit Motherboards:
i845E chipset: IT7, BD7II and BD7II-RAID
i845G chipset: BG7
i850E chipset: Not listed.
Reviews: Abit BG7 Review @ Tech Report. Abit IT7 Review @ HardOCP. Abit IT7 Review @ Hexus UK
AnandTech Threads: Abit BG7 thread. Abit IT7 thread. Abit AT7/IT7 Thread. Abit BD7-II Thread
Asus Motherboards:
i845E chipset: P4B533
i845G chipset: P4B533-V and P4B533-VM
i850E chipset: P4T533-C
Reviews: P4T533-C Review @ HardwareZone.
AnandTech Threads: P4T533-C Thread
DFI Motherboards:
i845E chipset: NB71-SC, NB73-EA, and NB73-ES. (Click the "products" link on the left-hand side of the page for motherboard models and specs).
i845G chipset: NB35-EC, NB35-EL, NB76-EA, and NB76-EA. (Click the "products" link on the left-hand side of the page for motherboard models and specs).
i850E chipset: Not listed.
Reviews: DFI NB76 Review @ VIAHardware. DFI NB76 Review @ TweakTown.
AnandTech Threads: None yet.
Epox Motherboards:
i845E chipset: 4BEA
i845G chipset: 4G4A and 4G4A+
i850E chipset: Not listed.
Reviews: Epox 4G4A+ Review @ TweakTown. Epox 4G4A+ Review @ OCWorkbench. Epox 4G4A+ Review @ VRZone.
AnandTech Threads: Epox 4G4A+ Thread
Gigabyte Motherboards:
i845E: 8IEXP, 8IEX, 8IE, 8IEMK, and 8IEML-T. (Click the "Pentium 4" link at the top of the page for motherboard models and specs).
i845G: 8IGX, 8IG, 8IGMK, 8IGML-T. (Click the "Pentium 4" link at the top of the page for motherboard models and specs).
i850E chipset: 8IHXP.
Reviews: Gigabyte P4 Titan 533 Review @ AnandTech
AnandTech Threads: Gigabyte 8IEXP Thread. Gigabyte 8IHXP Thread.
Iwill Motherboards:
i845E chipset: Not listed.
i845G chipset: Not listed.
i850E chipset: P4R533-N
Reviews: None yet.
AnandTech Threads: None yet.
MSI Motherboards:
i845E chipset: 845E Max (6566E) and 845E MAX2 LR (6398E)
i845G chipset: 845G Max (6580G) and 845G MAX L (6580G)
i850E chipset: Not listed.
Reviews: MSI 845E MAX2 Review @ Tbreak. MSI 845G Max Review @ AnandTech
AnandTech threads: MSI 845G Max Thread
Soltek Motherboards:
i845E chipset: 85DR2-L, 85DR2-L+, 85DIR2-L, 85DR2-C, and 85DIR2-C. (Click the "products" link at the top left-hand part of the page and then click the "Socket 478" link at the top of the next page for motherboard models and specs).
i845G chipset: 85MR and 85MIR-L (Click the "products" link at the top left-hand part of the page and then click the "Socket 478" link at the top of the next page for motherboard models and specs).
i850E chipset: Not Listed.
Reviews: None yet.
AnandTech Threads: None yet.