BagLady comprises two simple slash commands for managing inventory and mail (which you can easily add as macros/buttons).

/sort

Merges and sorts all items in your bags into a more-or-less reasonable order. First it merges stacks of similar items (hopefully freeing up a slot or two). Then it drops items into the "special" bags like Mining Bag, again freeing up slots from your normal bags. Finally it sorts all the items into the non-special bags into a linear order, roughly as follows:

1. Hearthstone 2. Cages 3. Reagents 4. Miscellaneous stuff 5. Explosives and projectiles 6. Armor and Weapons 7. Quest items 8. Soul Shards 9. Gray junk

The idea is that the stuff near the top of the list (in your backpack) won't move around that much, and the stuff at the bottom of the list (in your last bag) will be transient stuff like grays and shards. Any and all suggestions on changing the order are welcome!

To make this a button, make a macro containing a single line that says "/sort", then drag its icon onto your action bar.

/mailcall

Hit this when you're looking at your mailbox. It will run through the incoming mail and if there's money in any message -- like from an Auction House sale -- it will grab that money (deleting the message if it's empty) then report an itemization and total in the main chat window. For example:

Here's some dough $1g 23s 4c Black Diamond $0g 15s 5c Total haul: $1g 38s 9c

It's nothing but a quick way to grab lots of money from your mailbox.

To make this a button, make a macro containing a single line that says "/mailcall", then drag its icon onto your action bar.