I have used a Contour Showcase on all of my iPods in the past and have found them to offer a lot of protection without a lot of bulk.
When I bought my iPhone on iFriday, I looked at all the cases they had on hand at the Apple Store. Didn't really look for anything in particular....just some form of protection until I chose which case I
really wanted. (I also tend to love Vaja's cases...but they've not really got much to offer the iPhone yet.)
Anyway, on the racks I found a Contour iSee case for the iPhone.
http://contourcase.com/isee/iseeiPhone/
Although the pic on their website would lead you to think the case is frosted...but it is actually crystal clear.
For temporary protection it is more than I had hoped for. However, I could see myself keeping this as a full time case, too. It's not absolutely
everything I would want in an iPhone case...but it is damned close. Reasonable protection without a lot of bulk. Slips easily in and out of a pocket (I also hate wearing phones/beepers/etc on a belt or the like)
Give it a look. You could do a helluva lot worse or the money.
.....sT