My kit lens (18-55) and my telephoto zoom (55-250) have served me well since then but I have added a fast (but extremely fragile and cheap) Canon EF 50mm f/1.8 prime and my girlfriend surprised me with a gift of a Canon EF-S 10-22mm wide-angle zooms lens.
By no end do I claim to know what I'm doing when it comes to photography, as I am just starting out. The geek in me quickly takes the new prime lens, shoots a bunch of photos at various apertures, and then compares the EXIF data. Here is a flickr set of my test shots with both lenses. Check them out in the slideshow or click to go to flickr and read the captions: