The things he was most impressed about:
- OpenOffice (he really just need a nice way to make PDFs and presentations)
- He could use skype (he calls home to Brazil a lot)
- He could use all his other messengers
- Lots of software he was already familiar with is open source (he just didn't know it)
- It ran on his old computer extremely well and his hardware Just Worked(TM)
- He could learn the basics in an afternoon.