My Pentax K1000 had been languishing in its camera bag for a few years since I got my first digital in 2002 or so. (I held off for a long time because the early ones were just lousy!) I love the camera but the ease of using the digital, even without all the SLR goodness, was just hard to beat.
I hadn't even considered it when I started seriously shopping for a DSLR, but having ended up choosing a Pentax, it meant I could dig out the K1000 and at least give the lenses a new life. My "everyday" lens actually didn't fit the DSLR because it turns out that it was a Ricoh mount, not a Pentax one (but still fit on old Pentax SLRs, and could fit on the DSLR if I ground down some metal - not worth it for a cheap Craig 35-70mm)... but my Quantaray 70-210mm (decent enough) and my Sigma 28mm 2.8 (very nice) work perfectly.
The K1000 itself had been retired to being displayed on a shelf until I got the Zenitar 16mm fisheye. It works great on the DSLR but you lose a lot of the "fishy" effect due to the crop factor. It works perfectly on the K1000, though, and is a good match (as the lens is also fully manual), so I'll be bringing that along solely to take fisheye photos. It works out OK as the K1000 itself isn't very big, just one more thing to toss in the camera bag...
My wife's Canon SLR, however, really languishes. I can't remember the last time it was used - quite a few years ago. File that one next to her Kodak APS camera...