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I know software that I have written has been used (and probably cursed) by lots of people, but I don't think it has ever managed as high a profile as it is getting in the UK on Saturday.
This Saturday 14th April, through to Friday 20th April the Independent newspaper will be featuring a CD-ROM and workbook that teaches you how to play the keyboard. The software and lesson content is from a company called Gigajam and I wrote/fixed their software.
So if you are in the UK and want some "free" software to teach you how to play the keyboard, get out and buy that Independent...
Anyway, bragging over, here is a link to some more details
http://enjoyment.independent.co.uk/music/features/article2415382.ece</plug>
Spamming over.