Anybody know an online tool to generate Apache `mod_rewrite` rules to point people with simple .htaccess questions to?

I'm thinking of simple standard scenarios:

* Simple redirects (`url1`=>`url2`)
* Removing / adding `www.`
* `/a/b/c/d` to `index.php?value1=a&value2=b...`

and so on and so on....

I'm asking because most mod\_rewrite questions turning up on SO could be answered with a link to that, and help people help themselves (well, help as far as "help" goes with a generator tool that can be used without actually having to learn how things work.)