Score-it was written by a BGGer and has modules for several popular games including Agricola. It also is the only scorekeeper app that I've seen that allows for more than two players/teams.
CheckWord(free) or WordMaster($)-they will tell you if a word is scrabble legal. They can also do anagrams and help with crossword puzzles. I'd been wanting a Franklin Scrabble Companion for years, but couldn't bring myself to pay $40 for it. Now I don't have to.
Easy Wi-Fi-logs you onto AT&T wi fi spots easily
AroundMe-Tell it what type of business you need and it will show you what is available.
Amazon.com-take a picture of a book and it will find it for you and sell it to you.
Wikipanion-never wonder about anything ever again.
Edit: Just thought of this My wife really likes Frozen Lexicon. It is an anagram game.
Deck of card games - Solebon (solo games) - Cribbage - Backgammon - Batak - iSpadez - Briscas - Big Two (similar to Lexio/Tichu) $ - Yacht - Gin - Farkel
Score Trackers - Score - Werewolf Lite (voting device you can pass around).
Thanks for the list - capital job. While I'm sure I'll get a game or two (or ten), what I'm really looking for advice on is iPhone based tools to make my boardgaming experience better. Apps like BGG for recording plays, picking a game and the like. Boardgameprices for comparison shopping.