URL short redirection that's little different from the traditional

[Zach]

I like it. You should add some stuff, though.

• Add sequential URL generation so that users can leave the second field blank. I'm assuming that you're using a MySQL table with an auto_increment field, in which case you could use mysql_insert_id() in conjunction with some base-36 fumbling to get an alphanumeric, case-sensitive shortcode.
  
• Why not see if McAfee, WoT and Norton have APIs available? That way you can let users quickly see how safe the site is without making them leave your site, which is somewhat inconvenient.
  

Other than that, it's very nice.