SE Friendly URL's

Search Engine Friendly URL's is also the main thing to be done.. Many of us have dynamic sites
means site who's content changes daily. So url might be in such format
http://www.yoursite.com/xyz/pqr.php?t=123&f=90

well this links can be cached by google but still making more simplicity or making it in such way
that it shows it is static page helps lots in caching..

Well the above link can be converted in following form
http://www.yoursite.com/xyz/123/90/<title of page>.htm

This link will be more friendly then that old one...
So converting such links is called Mod Rewriting which i will provide some links where you can get more explanation regarding this.

http://www.workingwith.me.uk/articles/scripting/mod_rewrite

If you want more links. Please do reply i will post more and more

Thanks