donor, quest or even not dropped items in very large stacks. It's quite hard hack and works ascent rev. <4360.
First you have to get any repetable quest. After you've done this quest and before you click on Complete Quest run Wpe and enter this filter:
WPEslot 19 20 21 22
search 0 0 0 0
modify x x x x
where x x x x is number of item you can get after complete quest. Before rev. 4360 there wasn't any limit (normally should be 6) so you can enter any 4-byte number. To enter correct number you should do lots of tests. This part is hard, cuz you have to know structure of server memory, rev, database.
I hacked Wowscape and entered number in range: 7d d0 12 00. when I found first item, other items was easy to get, just add 8 to this value and you get next item ID. I think they found this bug by server log, cuz you can easy crash it entering ff ff ff ff in modify. Now I'm full donor and have lots of items gold and others