Hi Batfink,
Sorry I'm a bit late to this thread. I was looking for a road bike for a while and bought myself a second hand Cannondale a couple of weeks ago. Nice bike it is. There are alot of questions that will pop up once you start looking and the best place i found to go for road bike advice is the forums on the cycling plus website http://www.cyclingplus.co.uk
They also have a good 2nd hand section. If you want any more sites for 2nd hand give me a shout and I'll post all the sites I used during the course of my search.
Get on it though, can't beat getting out on the bike. Mountain bikes are obviously great but make sure you have some nice rides nearby otherwise you might find yourself going to the same places, road bikes are good as there are often loads of routes you can take from your doorstep and really get some miles in without feeling you're wasting your energy through chunky tyres etc.
HM