How do YOU keep track of your collection?

[Artemesia's Garden]

I'm doing an average to bad job.  I did have a spreadsheet but it's really out of date.  I wish I had kept track of individuals and who I bought them from since it's a great way to get to know people!

[poshmonsters]

I bought the inventory guides for my G3's and I just cross new additions out when I get them. Anything that isn't in the inventory guide is in a G4 pony journal I bought. G1's I keep well enough track of/don't buy enough of to warrant doing inventory and G4 I don't care enough to inventory.

[Elfpony]

I also have an excel sheet. Although I've never had trouble remembering which ponies I have, it's the accessories where I can get confused. The excel sheet has a tab for each gen, another for play sets, and another for my want list. All the ponies on the want list are already listed in their respective gen, but are marked in a colour so I know I don't have them. Then I just change the colour any time I add a new piece to the collection. I also mark down the pony's condition, and any special info (like if she was a gift from a friend or something). It's about my third iteration of a list, but this one seems to work for me.

Elf