Been spending this morning in a local coffee shop hacking away and improving my JSF skills, when I ran across an annoying problem… each time I undeployed my webapp so I could redeploy, it leaves the jar files behind (keeping me from redeploying). The only way I could successfully deploy after this was to stop tomcat, delete the files manually, and restart. How annoying! 
Luckily, a little googling yielded this fine solution, which I am sharing in hopes google picks this post up for other people, as it took me looking through 3 or 4 pages of google results to find it.
Good luck. 
