If the UK's long-term sovereign rating gets a downgrade, rates will have to go up before 2011 to support the pound, but apart from that proviso, my best guess is that they'll stay at 0.5% for the whole of 2010, mebbe reaching 1.5% by the end of next year.
The downgrade (or not) is going to depend on the reaction to the post-election budget, I reckon.
That said, I've called it wrong before plenty times!