Here you will find all the resources available to Script Developers.
Developer Script - If you're looking to start developing a script, this script will get you started. (updated to reflect PlayOn integration)
Lua Specific Functions - All the special functions added to Lua by the Scripts Plugin that will allow iteraction with the PlayOn Server.
Accessing the Options Dialog - Giving users access to options for your script via the Options Dialog.
Special variables and tags - An overview of Special variables and tags.
API Keywords and Overloads - For use with Notepad Plus and Programmer's Notepad 2
Recommended Tools
XBMC - XBox Media Center is a great way to test your scripts without having to access your media device.
Programmer's Notepad 2 - I use this to develop my Lua Scripts, it supports syntax highlighting and auto complete with the API Keywords and Overloads from above.
Adding Donation buttons
You can add donation links for Paypal and Amazon Gift Cards. For Paypal just add [paypal=YOUREMAIL@email.com] and for Amazon Gift Cards [giftcard=YOUREMAIL@email.com] the buttons will be automatically created for you.