Some interesting app recommendations from the I Love My iPad group on Ravelry:-
Paprika as a recipe book - clip from website and manually add your own (shopping list and use as meal planner too)
Quickoffice ($9.99) for viewing, creating, editing Mircosoft Office documents.
GoodReader (£2.99) for reading anything! Annotate pdfs and zoom in too. I especially liked this bit of their blurb "The ability to mark-up PDFs opens up new doors to GoodReader users who can now use typewriter text boxes, sticky notes, lines, arrows, and freehand drawings on top of a PDF file." Probably just the same as iAnnotate?
and one I forgot from my last list - Spotify.