iSync. Come one, I can't sync my PocketPC to a Mac? That's bull. Yes, I am aware of Missing Sync and PocketMac. Neither does the job.
Calculator...keep trying, you'll get it right eventually. But ****, it's just a freaking calculator.
Finder. cmdX in addition to cmdC and V. It's just common sense, it works that way in other applications for Mac, too; not just in Windows Explorer.
Read/Write mounting of remote FTP folders as network drives. Pretty please?
Integrate a zip/rar utility, while you're at it. StuffIt is too buggy for my taste.
Safari? Throw it away and pre-install Ffx with AdBlock Plus. Send the developers some $$$, too. Speaking of which, searching the Web from within other apps still calls up Safari, not my preferred browser. Fix that.
Apple Mail. Needs to get a better junk filter. Compare to the one in Outlook 2003 latest SP. "Accept only mail from TLDs you choose" Killfile .ru and .kr, and you got rid of 90% of all junk.
iChat. Needs support for other networks. Really, I actually do know people who don't use Macs. Most of them, actually.
And bit less annoying, intrusive badgering to sign up for a .mac account.