Far to few posts about photography apps for the iPhone. I have to change that. You can always visit iPhoneography or Life in LoFi if you want a constant stream of iPhone photography related material. Both sites are great and I visit them often.
I’m still into really grimey, grungy photography and I’ve found that the app PhotoToaster by East Coast Pixels ($1.99 @ the App Store) is great for applying nice filters and effects of the grungy, yet subtle kind. The more subtle effects offered by the app are nice as well. Some examples from a shot I took in the wood shop:
UPDATE Oct 11, 2011: There’s now a free version called PhotoToaster Jr. on the App Store. Try it out before getting the full app!