As andypaul said, the visa you will have after the Fiancee Visa is FLR, and is valid for 2 years. The next step (before the FLR expires and after you have been in the UK for 2 years) is to apply for ILR. But, since April 2007, it is now also necessary to pass the Life In the UK test: this is a prerequisite to obtaining ILR...
