Instagram comparisons aside, Facebook Camera is a pretty nice app. It's fast, and the filters are tasteful — the ones that aren't exactly like Instagram's tend to be less aggressive and borderless. You can download it here, it's free.
Anyway, here's how the filters — and the main interface — compare:
Brannan = Highlight
Hudson = Neon
Sierra = Rouge
X-Pro II = Boost
Earlybird = Copper
Hefe = Golden
