rescue alone

• tomsrtbt
• linuxcare bootable toolbox
• lnx-bbc
• Linuxcare's list of related projects
• Newsforge: A tale of two bootable business cards
• bblcd
• linux pills - not a mini dist, but rather kernels and roots for many different rescue situations
• Insert: Rescue and security, actually.

could be used for rescue, but perhaps more for booting off a cdrom and doing real work, EG testing before buying

• cool linux cd - based on Redhat 7.3
• Morphix - livecd with gnome
• Knoppix - mainly KDE
• dynebolic
• a list of cd-based distributions from distrowatch
• ADIOS - Gnome, KDE, IceWM, redhat (redhat 8 Thu Aug 28 14:43:06 PDT 2003) based
• Gnoppix - Like knoppix, but with Gnome

compact flash distributions

• cflinux

Not exactly a rescue distribution

• DBAN - for zotting a disk after you've decided to dispose of it.