I was going to write up a nice succinct description of the reasons and then I read SharePoint Joel’s and said, these will do just fine! Thank you again Joel.

In quotes as it was copy/pasted with respect. Go read the rest at Joel’s blog.

WSS & MOSS SP2 is Available - 5 No Brainer Reasons to Install

It’s nice when things happen as expected.

Five No Brainer Reasons to Install SP2 (When you are ready!!!)

1. Performance Reliability/Stability Fixes

2. Browser support for IE 8 and improvements in tier 2 browsers (Firefox)

3. Reliability improvements in Indexing and Index Corpus

4. Security Improvements

5. New STSADM Commands including some to fix corruption and relationships (orphaning)

WSS & MOSS SP2 is Available - 5 No Brainer Reasons to Install - SharePoint Joel's SharePoint Land