I was under the impression that you were already running Debian sarge.
Which numerical Debian release are you currently running?
Woody is 3.0r0 through 3.0r5
Sarge is 3.1r0a.

As for upgrading from Woody to Sarge, see the release notes http://www.us.debian.org/releases/st...rading.en.html as it covers the entire topic.