OSX:
automatic undo delete from trash that puts the files back where they were
being able to change the background picture at certain times not just intervalls and be able to specify as many pictures/times as I want like the options for smart lists (for a night/day rhythm for example)
be able to isync entire home directories between computers
better speech recognition and voices
truly resolution independent GUI
Dictionary.app for the 5-6 main languages
Mail:
scheduled sending of emails
let mail recognize nicknames from adressbook for autmatic email adress completion
prevent mail from changing entries in adress book
mailing lists
icards from mail
Quicktime:
playlist for movies
remember volume after closing
better handling of other file formats (built in divx encoder for example) more formats
iChat:
ichat to be able to use nicknames instead of full names out of the adress book
ichat to use tabs
ichat to use msn
re-login after lost connection
different sound for buddies going away and offline
option to show pics/buddy icons only
I'd be more than content with this. Though most of this should have been in Tiger already...
Oh... and
please change these things back!