Welcome to the forums, Garrison. I'm a newbie here too. I agree with the previous posters. Soon after I got my S3 IS I purchased a 52 mm lens adapter, uv filter, and an inexpensive snap-on lens cap from lensmateonline.com. Then recently I picked up a circular polarizer filter. A 2 gig Sandisk card, batteries, charger, and basic case came bundled with my S3.
If you're planning on eventually buying wide angle and/or tele-converter lenses, I believe (at least I think I've read that) you'll need a 58mm adapter though; at least for Canon brand lenses. Maybe someone else here knows the facts about that? I'd suggest researching that before investing money in the 52mm.