Here's the dependencies for some of the basic tweaks.
SBSettings
SBSettings
libhide
MobileSubstrate
shell-cmds
SBSettingsToggles
Airplane SBSettings Toggle
Serious SBSettings HD
iFile
iFile Cracked (recommended version from our repo)
file-cmds
zip
unzip
7-zip (POSIX)
gzip
bzip2
unrar
SiNfuL iPhone RepoPrep
Winterboard
Winterboard
MobileSubstrate
shell-cmds
PreferenceLoader
libhide
Find Utilities
MobileTerminal
MobileTerminal
Debian Packager
Bourne-Again SHell
Core Utilities
New Curses
system-cmds
APT 0.7 Strict
Erica Utilities
Activator
Activator
MobileSubstrate
PreferenceLoader
I can add more if you wish, just name the tweak and I can add the dependencies here.
I'm posting this as I cooked a custom firmware using Sn0wbreeze and wanted to add these tweaks but it would be impossible without their dependencies, so I thought I'd share this info with you.