For example, the Firefox and Chrome nightlies:
A couple million hackers can help "upgrade" the Internet every day.
2) Ask/answer questions. You're making it a lot easier for the next guy.
How can I do X in Linux?
How can I do Y in Gimp?
How can I do Z in Inkscape?
now would i like people to contribute by way of code, money or bug reports? definitely. but they should do so because that is a gift they wish to give to the ecosystem-at-large, not out of some sense of reciprocal obligations.
@Droob : Yes and no, for sure, if you look at the BSD license or the MIT or whatever, there is not reciprocity implied, but if you look at the GPL, there is. If you look at that piece (http://www.gnu.org/licenses/why-not-lgpl.en.html) for example, it's pretty obvious there is a certain "brotherhood" mind implied.
But I think that even if there were no reciprocity implied, giving is more or less morally mandatory (for the bandwidth, hosting cost, etc) ...
We all do open source because we simply love it and want to give a gift, like you said. However, whenever people give me a gift, no matter how bad or good it is, I feel it's my duty to at least say "Thanks!"