[CentOS] To upgrade or not

My laptop is a Thinkpad T20 running CentOS 5.1

The reason it is running CentOS at all is because Fedora Core 6 was 
workable on it, but Fedora 8 was a complete dog.

Anyway - with all the new desktop stuff in CentOS 5.2 I'm wondering if I 
would be happier just leaving it at 5.1 rather than letting it update to 
5.2.

Will 5.1 continue to get security fixes if I leave it at 5.1 or do I 
need to update to 5.2 to get the patches?

I'm planning to replace it at some point, just haven't seen T40s on eBay 
drop to my price range yet.