Clickable: http://www.ditchit.com.au

Congratulations on getting something out there - for me that's always the hardest part!

One thing I noticed is that if I remove the value to any of the $_GET variables in your urls I get a mysql error. Not sure how you're handling the data coming in to display listings, categories, etc. but be sure to guard against SQL Injection (http://en.wikipedia.org/wiki/Sql_injection).

Also, don't forget to add some meta tags (like description and keywords). I always forget to do stuff like that so I bookmarked http://lite.launchlist.net/ to help myself remember.