Tiresias
The Tiresias font has been released under GPLv3 and this has come up on a number of mailing lists I’m on, including the Sugar list (Sugar is the OLPC interface) a few days ago.
Sadly fonts under all versions of the GPL need the “font exception” as recommended by the FSF - and this font doesn’t have it, so it seems that all (PDF) documents that embed the GPL version are also licensed under the GPL, or not redistributable. (I have contacted RNIB about this already)
My personal opinion on the font is that its a solid workhorse humanist sans serif. I personally think its a good example. They were fashionable recently but a bit over the hill now.
Inconsolata is nice for monospaced (code) work.

The Tiresias by David Crossland, except the quotations and unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Share Alike 3.0 Unported License.
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Joe Clark points out some of the shortfallings of this typeface on his blog. I don’t have the link handy, but I’m sure that Google can turn it up.
@Dan: Yes, the wikipedia page on the Tiresias typeface has a link to his critique. Many fonts that are marketed like this one have their validity questioned; I’m not sure which is the best one.