I've just started having a look at Fuel PHP.  I'm not going to go through the pros and cons as Phil Sturgeon has a very good write up on his blog.

So I decided to get my hands dirty and add a few comments that might be useful.

Fuel needs php5.3+ so update your WAMP or MAMP to the latest version. On Mac if your installed php version is 5.2 you'll need this little trick so you can use php5.3