You should ask for help on the support mailing list.
The openmoko community mailing list is perhaps the most active. As of July 2008, its volume amounts to dozens of messages per day. Openmoko people are there too. When posting about a specific distribution, please start the subject line with its name between bracket: [FSO], [2008.9]...
Lots of Debian and FSO discussions among the pkg-fso team takes place on the Smartphones-userland list.
There is always a good group in the IRC channel #openmoko on FreeNode. If you aren't an IRC-er, you might want to review the discussions anyways:
(Courtesy of the NSLU2-Linux project)
Within the time contstraints of middle Europe, the Freenode channel #neo1973-germany is also active and members switch to english on demand.
You can also hang out in #openmoko-cdevel (the community developers channel) on chat.freenode.net if you have development questions.
The blogs of openmoko fans and developpers are aggregated at planet.openmoko.org. Only posts tagged openmoko are syndicated. The planet is multilingual. To get your blog added, please open a ticket on the admin-trac (you will need to open an account first).
Community Updates try to sum up what has been happening all over. Updates are also mailed to the openmoko-community mailing list, and major updates are also sent to the announce list.
Wolfgang Spraul tries to give a weekly summary of what's going on in Openmoko. You can follow it at the devel mailing list or follow the Weekly Engineering News page.
The old community wiki is at http://www.linuxtogo.org/gowiki/OpenMoko/, since the release of the official wiki at http://wiki.openmoko.org/, it should no longer be used for OpenMoko. Please help integrating the content of the old wiki into this wiki. Please note that you cannot just copy from the old wiki, as the old wiki is (unfortunately) not clearly licensed and the content on this wiki is licensed under GNU FDL. You will instead need to rewrite the articles.
When you have integrated/rewritten an article, please update the old wiki with clear information that you have moved the information, so others do not update the old page.
In other languages
In alphabetical order, there are many more other ressources.
The German Neo1973 community created a Trac-based web site with SVN version control for their community projects: http://neo1973-germany.de/ The most notable project is Zad, which consists of a GUI and daemons for GSM/GPRS muxing, GSM, GPS and more, written using Enlightment for smooth, smooth, fast, alpha-blended graphics and glib and dbus for daemons, but the actual code of the project is all python. And yes, you can even make phone calls with it (even without "echo").
There is a spanish mailing list.