what to do with an unused Canon 20D...
....why, send it to Advanced Camera Sytems of course to be changed to take Infra Red images.
I kept my 20D after buying a 40D, but have never used it since. So, like half of togs in the UK, I've sent it to have the filter on the sensor changed, cleaned and calibrated to take IR images.
I sent it the first week in January, but there's quite a backlog I understand, so I'll give them a ring the end of Feb to see what's happening.
Watch this space !