We painted the trim on our recessed cans in our basement (TV room, bar area, landing, and bathroom). Just used the same paint as for the ceiling. It's been nearly a year - no dust. (As dallasbill said, dust falls down, not up). We only painted the white ring that showed. We used the silver haze inside the cans and did not paint that. I'm very happy with the result. Wish I could paint the smoke detectors.... The kitchen might have different issues with cooking greases etc....

I didn't mean to imply that incandescent bulbs would be preferable, only that I know more about them. 5" cans will typically accept PAR-30 halogen bulbs. Some can/trim combinations can take 75 watt bulbs, some only 50 watts. The 50-watt PAR bulb would produce about the same amount of light that the R30 fluorescents do, but use three times as much electricity and produce a tighter beamspread. The 75-watt version would produce almost twice as much light. Dimming incandescents is easy - pretty much any old dimmer will do. Dimming fluorescents is trickier, and whether it's possible depends on the ballast that drives the bulb. Screw-in CFLs each have their own individual ballast, which is housed in the plastic base that the ends of the tubes plug into. If you want to dim CFLs, you need to buy special "dimmable" bulbs. It's my understanding that some can be dimmed with common, everyday dimmers and that some require a special type of dimmer, but this really isn't one of my stronger areas of understanding.

Sombreuil_mongrel mentioned the haze ones. Those are the ones we have (made by Juno Lighting) in our kitchen both for our 4" and 5" cans. They are wonderful as they actually do seem to disappear into the ceiling--no "ceiling acne" (as someone here called can lighting awhile back). We have the black baffles in our basement ceiling and the haze ones are much, much nicer IMO--worth the upcharge. You can check out the various colours on Juno's website but there may well be other manufacturers of the coloured baffles too. Another way to make can lights more esthetically pleasing is to use frosted (sometimes called "ice") halogen bulbs. We found them a bit harder to find than regular ones, but again, we felt they were worth it.

We used Juno recessed with the Alzak trim in Haze. They blend in nicely with a white ceiling and do not look like a bunch of black holes. They also help reduce the glare when the lights are on. This is a picture, although not a very good one, of a portion of our kitchen with two of the recessed lights. They are on with 75 watt halogen floods and not dimmed. Here is a link that might be useful: Recessed light with Haze Trim