Search using Tags

The main Tags Page lists quite a lot of tags. But it cannot list them all. http://wordpress.com/tag/life/ lists all those posts tagged ‘Life’ which is great if you are after that subject but if you are after something not covered, all is not lost.
Just change the last word and use a - for a space.

All these are not listed in the main Tags page but people are blogging about them:
http://wordpress.com/tag/cheese/
http://wordpress.com/tag/rain/
http://wordpress.com/tag/bill-gates/
http://wordpress.com/tag/chocolate/
http://wordpress.com/tag/peanut-butter/
http://wordpress.com/tag/caffiene/

If you want a general search, use Google. Put
site:wordpress.com search-term
into them and it will just return results from us.
But if you want something a little more specific the tag usage above should help.

And you have your Tag Surfer too.