I'm interested in reading more about Thor, so was the run that followed JMS any good? How good are the current Thor books, and what about the Iron Man/Thor limited series, was that any good?
Kieron Gillen's run (the one after JMS) was generally pretty good, worth picking up. It filled in some of Siege's gaps (read Siege, it's not bad and has a lot of Thor) and concluded JMS's run reasonably well. It's coming out in an Ultimate Collection soon - don't get the trades, they only collect about three issues each.
If you want to read more Thor, there are two runs I highly recommend:
Walt Simonson's defining run, collected in the Walt Simonson omnibus.
Dan Jurgen's run after Heroes Reborn, which brought a classic feel back to the comic. It's available in 11 different trades.