http://megadeth.rockmetal.art.pl/tabs_guitar.html
http://members.cox.net/iceddeth/tabs/tabs.htm
http://www.powerchords.org/metaltab/
(lots o'stuff at this one)
http://warzone.siderealweb.com/guitartabs.htm
(same here)
http://ultimatemegadeth.com/
http://abysslord.com/megadeth/tabs/tab.htm
Lots of stuff on these sites for Megadeth - use your judgement and do some crossreferencing to get the best works, other than that they seem to be pretty complete as far as song coverage goes.
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[Edited by sithgt6 on 05-23-2003 at 08:40 AM]