There are 2 types of bootloaders generally used for linux. Both are easily used for dual booting.
Their names are Lilo and Grub. If you do a quick search in
www.google.com there are plenty of booting howtos that include windows for both of them.
Some installation cd's are usefull for gaining access to a linux partition so that you can fix a badly configured lilo or grub, or reinstall the bootloader in the MBR.
However since your probably familar with windows stuff. You can use the program Loadlin to boot into linux from DOS. However if you use a NT based OS like w2k or XP that probably wont work.
You can use the NTLDR NT-based bootloader to gain access to a linux OS, but I am unfamilar with it. If you search in Google or search thru these forums, many people have talked about and gave directions on how to use the windows bootloader to dual boot with linux.