I'm not very familiar with the different clients. I use QT and am trying to advise a friend who is new to Bitcoin, but QT is going to take forever to synch. What do people make of the lightweight ones? Which is the best and why?
MultiBit and Electrum are both pretty good.
Some people are uncomfortable with web hosted wallets, but they can be quite convenient for small amounts. The only web wallet that I trust at all is blockchain.info/wallet