In reply to the ant hill mob:
Driving in Malta is for the brave. The locals are mental, and I really don't enjoy it.
The buses are OK, and have the major advantage that they are much bigger than cars! Couldn't give you chapter and verse on which crags are reachable by bus, but you can reach a fair number of them.
Trad rack is worth taking, although a lot of stuff has been retro bolted in the last couple of years.
Finally, it's worth spending an evening in Mdina. There's a good pizza place there, and a fantastic cake shop/cafe!