Yup the 3.3v, 1.5v and 0.8v relate to the signalling used by the AGP1.0, AGP2.0 and AGP3.0 standards. Old cards (Voodoo Banshee type vintage) are AGP1.0 with a max multiplier of 2xAGP using 3.3v, nearly all even remotely new cards are AGP2.0 with max multiplier of 4xAGP using 1.5v while the latest cards like Xabre, Rad9700 and GF4-8X are AGP3.0 using 0.8v signalling with a max multiplier of 8xAGP. If your mobo has an AGP1.0 slot then it is very unlikely to work without problems with the newer AGP2.0+ cards. If your mobo has an AGP2.0 (non-Uni) slot then the older AGP1.0-type cards won't work although AGP3.0 should. If your mobo has a Universal AGP2.0 slot then it can take the oldest AGP gfx cards as well as all the new ones inc AGP3.0. I'm unsure about exactly what the AGP3.0 slots will take, but I should imagine they'll take all AGP2.0 cards but you'll need the Universal AGP3.0 to take the oldest AGP1.0-type cards.
Jeff7 image quality refers to the clarity, stability and legibility of the image which is sent to the monitor, most noticable in the highest resolutions with refresh rates above 70Hz. You may need to get above 1024x768 to really notice much diff, perhaps even 1600x1200 with some of the most recent cards. Comparing a GF2 to a GF4TI to a Parhelia should show a very marked improvement ... but as with many things like this it does come down to personal preferences and sensitivities just like the Hz needed to remove flicker or the FPS needed for a game to look smooth.
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