Photoshop
If you own any registered Photoshop product you have probably received an e-mail offering the current version, CS2, for half-price. I'm not at all sure that this is a good deal, at least until we know what the upgrade price would be. Adobe has already announced two NEW versions of Photoshop CS3.
As you may know, Photoshop is a very expensive piece of software; when I tried it several versions ago I decided that it wasn't for me and the photography I do. A lighter version, Photoshop Elements, is available for less than $100 with most of CS2's capabilities.