my favorite is cPro+ craigslist client by Escargot Studios LLC. I like it so much I won't search craigslist on anything else like my laptop. I liked pauls search but it really needs a thumbnail photo. That's the biggest thing I like with the CL apps! you can seach multiple locations, set up alerts etc.
the ebay one is good too.
See you on the trail
Couple o' FJ40's, BJ70, PZJ77, UZJ100, TDI