I know it's an Old thread but...
I had to chime back in here as i've discovered new software that I've been using since my original replies here and I highly recommend it for any web devs or casual tinkerers.
Textastic allows you to test the pages you are working on within the app short of any Server Side scripting of course. It also supports ftp/sftp.
It's also available for the Mac as well.
Look for Textastic in the App store... iOS & Mac
Textastic - Text, Code and Markup Editor with Syntax Highlighting - FTP, SFTP, Dropbox - for iPad
Textastic: The iOS Code Editor to Beat, Now on the Mac | Mac.AppStormTextastic Rivals the Amazing Plain Text Code Editor TextMate for a Tiny Fraction of the Price
Textastic Code Editor | Productivity software | Macworld