I am trying to multiboot win2k, Slackware but all the methods I have read requires me to use a bootdisk. I don't have a floppydrive, is there a boot CD ISO image I can burn similar to the bootdisk slackware install creates for me?

You should be able to put CD1 in the drive and boot to it.

for those that don't know about CDrom boot disks, I found this:

http://www.tldp.org/HOWTO/Bootdisk-HOWTO/cd-roms.html

Sorry if this seems too obvious, but what about lilo ???.
Just add an entry for your windows system - everyone and his mother does this sort of thing.
You can always boot Slack from the W2K boot.ini as well - although doing this with lilo in just plain crazy.
Never have agreed with Pat only offering lilo.

IMHO, grub is the go in almost all cases - even has an El Torito option documented.

Then there is grub4dos - offers a more "native" CD support, although I haven't tried it yet, and it is still beta, so assess your risk profile.

You have a boatload of options - a (floppy) boot-disk is the last thing I'd consider these days.