The answer is; Yes, if you want to strengthen your security and resolve the following issues:
- Some security hardening to media uploads
- Performance improvements
- Fixes for IIS6 support
- Fixes for taxonomy and PATHINFO (/index.php/) permalinks
- Fixes for various query and taxonomy edge cases that caused some plugin compatibility issues
- Visual editor not displaying
- Themes experiencing post display problems
Plus, a few more items relating more to the WordPress core.
By the way, WordPress team left a haiku for all who ask if they need to upgrade.
Only the geeks know
What half this stuff even means
Don’t worry — update
I love it. LOL! :D
Update: April 27, 2011
WordPress released version 3.2.1 for the vulnerability that allowed Contributor-level users to improperly publish posts. To me, blogs with multiple authors should highly consider upgrading to this version.