Two things I did to help with bank alts.

1) sell everything and be more selective about what is banked.
* I made a good amount of cash this way and everything in the game is replaceable. I did this on my current server when I went to play on another server about 8 months ago (only recently came back). This got rid of a lot of pre-BC stuff and mostly now acts as temp storage that I can mail stuff to and as my auction mule.

2) create a guild for your alts with a bank
* I have a guild specifically for my banks/unplayed alts with different trade skills I still use. What this does is first of all limit the amount of crap I can store (I only have 1 tab). Second of all, I won't forget where anything is at. So I can store primals, gems and enchanting mats without losing them _and_ I can easily see how much I have and auction off the surplus.


As for other alts, I'm going to need to free up at least one slot for my DK when WotLK is released