Thought I'd start a topic to share two websites I find quite interesting to browse through:
UK Walking Forum - With more than 300,000 posts, saying this is an active forum would be an understatement

Lots of good discussions and sharing of walking routes goes on, as well as even some Geocaching (walks, of course

) discussion. Not a member myself, but interesting to browse and read about walks, plus there are some super photos on there ;
The Walking Englishman - this is a super website, with many, many walks listed on it, plus some finer details (such as distance, ascents etc). As an extra, each walk is accounted and has photos of its course - oh and there are downloadable GPX files of the routes too

Occasional mention of Geocaching, but not much.
Feel free to share any of your own websites which are handy for finding good walks, cache or cacheless here:)