They're designed specifically for more recent digital cameras with the 1.6 crop factor-sized sensor and won't fit anything other than those models stated (at the moment, 300D, 350D and 20D) as they're a bit shorter at the back end.
The crop factor still applies.
As long as Canon keep making bodies with a similar-sized sensor they'll keep making these lenses and probably add a few more.
Independent lens makers' offerings with a similar sized image-circle will fit other bodies even full-framed ones although with those you'll get a circular image in the middle of the frame. Some of the zoom lenses can actually be used over some of their range with the 1.3 crop-factor 1D bodies without cut-off (tests in photo magazines will usually give the range possible)
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