A press release over the weekend announced that the Directory of Open Access Journals, or DOAJ (www.doaj.org), has added a service to the site that allows authors to determine whether or not there is a submission fee for an OA journal in which they are interested in publishing. Basically, the "find journals" feature now has two more search filters, one for "free to publish" titles and the other for "author pays to publish" (I think something like "submission fee required to publish" would have been a preferable way to phrase the latter but...). The press release also notes that the DOAJ folks don't have the submission fee information for all the journals and would appreciate any such information for those that they do not have.
I saw the press release on the liblicense-l list. The press release can also be found in the "news" section of the DOAJ site at http://www.doaj.org/doaj?func=loadTempl&templ=061014.
On a related note, the main page of the DOAJ site notes that there are now 2414 journals in the directory. Not too shabby, I think.