ncarty97: Well, one thing to remember is that Ultima III is pre-Avatar/karma. I don't know if you'd consider it a cheat or not, but I would always go west from Britain to the town that is sort of hidden in a forest (can't remember the name). IIRC there are no guards in the town. So, I'd go in, slaughter and loot everything, exit and repeat (all the NPC's come back).
I don't think its a cheat necessarily, though its certainly not a very nice thing to do!
Yeah that would be YEW, you have to go there to learn pray if I recall(or am I mixing that part up with the NES version?) but it's easy to go on a killing spree there as they are all low level clerics. I personally managed to finish the game without doing that, worse case go dungeon crawling there's a easy dungeon a little ways west of castle Britannia hidden among a mountain pass you can also fine the mark of fire there on the first floor.
I just hang out on floor 1, kill monsters and then head up when I need to recover, head back in kill some more, lather rinse repeat. Just don't go too far if you don't have much food as there be hidden gremlins in there dungeons and they will steal all your food if your not careful.