If you are looking for an interesting font for your documents Ubuntu font it may be a good choice.
The development was founded by Canonical [the company behind the Ububtu Linux] and design by Dalton Maag, the same who designed fonts for BMW, Nokia and McDonald's is a fine piece to your font collection. The font is open source, free to download and use.
It is a sans-sherif typeface and is screen oriented but it can look very nice on printed documents too.
Ubuntu family have three fonts: Ubuntu, Ubuntu Condensed and Ubuntu Monospace.