Just to repeat some of above:

- Pinwiki is a really good source for info.
- RGP (rec.games.pinball) is still a great place for info... .the amount of tech help that is out there is incredible (hopefully all of the old posts can still be found). Last year, I went to RGP for help when I could not find answer/help here.... and RGP came through with help . Still some great people there as well.
- Pinside still has some great tech help.

I think someone said above, what really helps is when posting tech type topics is if the subject heading is clear so people can find it later while searching.