creating an opening plan

I'm trying to do as Silman suggests here. I've been using a spreadsheet, but it strikes me that there might be some decent free program to the end of creating opening graphs and such that might have/be able to be plugged into chess openings databases.

Anyone know of such a thing?

um chessbase?

but two out of three ain't bad ;)

Thanks for that, but I've already tried SCID before, and while it seems like a decent program, it's not really what I'm after.

Maybe I should write one myself.

An idea would be to create 2 accounts and play out all of your opening lines as unrated games, then using the My Games feature in game explorer, you could then organize your opening repetoire in a decent, free program. 

Edit: Sorry, seems like this doesn't work as unrated games don't show up in Game Explorer

I'd probably prefer to do the .pgn suggestion instead of that... I'll stick with my spreadsheet for a while, cumbersome though it is.