I had the same idea than you (website with full tennis results).
For the women, many results can be found on the equivalent website www.tennisforum.com/forumdisplay.php?f=59
. I copied many results from this site and other sources in a database (worldwidetennisdatabase : databases, and some stats extracted from those databases). I have only entered the finals (no semi quarters... results so far... it would have been too long, I admit)... I think that the advantage of a database over a forum or wiki is that you can easily extract statistics.
For the pro results, you can also check the very good book "History of Professional Tennis", from McCauley. I think it encloses the most complete results for the pre-68 pro period.
Hope it helps...
By the way, if you have results to complete the database I've begun, do not hesitate !