Thanks. I will give that one a try.

Mail expiry fu will monitor when you last checked your alt's mail.

May I also suggest the addon BankItems. It doesn't do all the cooldown, calendar, tradeskill, etc etc tracking that Altoholic does, but it does do the Bank, Mail and Guild Bank very well.

I'll second the recommendation for BankItems. It tracks across servers, and most awesomely, gives you a searchable database.

Forget where that item is? Search, and it'll tell you it's in your bank, bag 3, slot 4, etc.

I use both Armory and Altoholic. The latter I use mostly as a your-account-at-a-glance kind of thing to look at stuff like rested XP, gear and average item level, currencies, log-out locations, and achievements. The former is great as a deep character inspect that includes inventory, personal bank, and tradeskills.

I came here to suggest Armory. Someone else already has. Well played, sir. Armory is an amazing addon. Most of the stuff people mention in the other replies to this armory suggestion, Armory already does.

I can't imagine what Altoholic could offer that I don't already have with Armory.

I was going to suggest Armory as well. I also use something called AllPlayed (http://wow.curse.com/downloads/wow-addons/details/all-played-laotseu.aspx), which gives me some of the other information that was mentioned (rested xp, log out location, total gold and total time played for each toon)

Armory is by far one of my favorites!

I should've also mentioned this: Armory now also comes with an LDB feed that creates a tooltip with a mind-boggling amount of useful information on all your toons layed out in a very compact matrix format. I don't think I've seen or heard of any other addon that's as useful for keeping track of a character you're not logged into.