In reply to dsh:
Hi, There are 2 different guide books in which you can currently get for the Gower.
The Climbers club guide is the older of the two, yet is very descriptive on routes. the new guide book, i haven't personally used, but looking at previews of it, looks really good and that is available on amazon:
Gower Rock: Selected Rock Climbs
In regards to tidal, there is alot of venues that are tidal, such as three cliffs and king wall on fall bay. yet there is still Fall bay itself which is non tidal, and has some great single/ multi pitch classic routes that are worth a visit and there are numerous other areas that offer some fantastic climbing (Paviland)
If your looking for a particular grade, i can suggest a few routes that might be worth looking at.
Hope this helps
Will