Ok, HBT... I realize I'm a total necromancer for reviving this thread

but I wanted to (finally) post the pictures I promised like 4 months ago! This is following the technique posted here:
http://www.homebrewtalk.com/f51/marking-your-carboy-63174/. Thanks, Revvy, for the link...
Here are some shots of the final outcome. I am really pleased with how it came out and would recommend this technique to anyone who wants to etch carboys, bottles, mugs, mirrors, whatever!
This carboy is actually on its side. I sanatize with only about 2 gallons of iodophor and then rotate the carboy a few degrees every 3-4 minutes.
Here's a better upright shot.
A close up of the numbers.
I added this pic to show that I put rings all the way around the carboy so I could tell how full it was no matter how it was rotated. It was hard to mask off with the tape but really worth it.
OK, Thanks for letting me share!
-Tripod