A DSLR camera is a fine thing. My Canon EOS 450D (also labeled as Canon EOS Rebel XSi) gives me a lot of pleasure even with its standard kit lens Canon EF-S 18-55mm 3.5-5.6 IS.
After three years there has been the first defect now. During a mountain hike the autofocus stopped working.
This article outlines how I solved the problem for about $10. And even if your AF is currently still working, it may be interesting to you how to disassemble a Canon EF-S lens.