When I bought the 350D I got the kit lens (an EF-S 17-55mm f/3.5-5.6 Canon lens (27-88mm equivalent). It’s so cheap as to be a no-brainer, unless you plan on dropping somewhere between $1,000 and $2,000 on your main walkabout lens when you buy the camera (or already have one). Nice idea, but I have a mortgage.
From my perspective the kit lens has one glaring weakness: a fairly narrow maximum aperture; you’ll most likely do no better than f/4 unless you’re shooting wide angle. People used to better lenses than me will also tell you it’s quite soft compared to a good (read: prime or L-quality Canon) lens.
But the aperture bugs me more at the moment; with an f/4 aperture I often need a flash for indoor photography, especially in the evening. I far prefer a natural light. On top of that, it limits depth of field effects.
So I did what everyone said I should do: get what was for many years regarded as the 35mm photographer’s standard lens, a 50mm prime.
The 50mm on a standard 35mm camera is supposed to give about equivalent view to ordinary, unmagnified human vision; it ends up giving the same field of view as an 80mm lens on my 350D (due to the crop of the small sensor) but still has the DOF of a 50mm. That crop adds some interesting complications; at 80mm equiv a 50mm prime is a bit tighter and requires I get further away to get an orthodox 50mm shot, which could be a curse indoors.
There are other options: a 30-ish mm lens will give the 50mm magnification, but will have the same DOF as a wide angle lens. More importantly they’re expensive; a wide-angle lens with a max aperture of f/2 will cost as much, not as the $200 50mm f/1.8, but the high-end 50mm f/1.4 USM.
At $200, given my ability to walk backwards, the 50mm f/1.8 is a no-brainer. And I’m delighted with itit’s giving me exactly what I want in the way of DOF, fast shutter speeds at normal light levels. It does have some drawbacks: it’s noisy compared to the kit lens, and like a industrial site compared to my USM telephoto lens.
It’s also not robust; I dropped the first one from a table maybe half a metre high, and it exploded into component parts. It was cheaper to replace than repair, especially since the fine folks at Wellington Photographic Supplies took pity on me and gave the replacement for wholesale.
Some sample shots:
Jaques (click here for full size version); f/1.8, 1/160s:

Jaques and Isis (click here for full size version); f/1.8, 1/320s:

Greg and Tamon (click here for full size version); f/3.5, 1/160s:
