You´re asking the wrong person... Most of them have a better resolution than normal digicams and the great advantage are the changeable lenses ( if one has the money to buy them)
I am just thinking about a new cam (Fuji S3 Pro) and three lenses: we´re talking about 2.200€
woah, that's alot of money!
I'm buying a new digicam, for $350, it has double the megapixels my camera has now.
I'm pretty sure I can change and add lenses to it.... Not 100% sure though.. o_O
Oh well, if it doesnt, I'll just wait a few more years for an SLR, I've done fine without lenses for now