Well here in the UK I think you'd be hard pushed to find many people who know about CraigsList, let alone people who actually use it.
A large UK based one is:
Ad Trader classifieds, Free local classified ads with images - 584,096 ads online now. - they also run a lot of local free ad's papers.
And for Cars, Bikes etc. we use
Auto Trader UK - Buy & Sell New & Used Cars, Car Loans, Car Insurance
I'm not sure what the big fuss about craigslist is - it looks very amateur. Personally its not for me.