We're just about to release our gambling website... maybe you can help us with a little testing, and proof reading and then we can give you some shares... what do you think?
If you want to know how to 'detect' transactions i would recomend you using blockchaininfo's api + blockexplorer + bitcoinmonitor.net (just in case one of them fails)... better than installing the bitcoin daemon.
Bitcoinerr works with the bitcoin daemon, but as the blockchain is getting bigger, the vps is getting more and more expensive. That's why i'm researching for alternative methods.
I could easily write software to run on your computer to tunnel the blockchain website for information but I couldn't make a script to do the same in a web page.
I only write applications for the computer not web scripts, sorry.