After my post on the search for a decent JavaScript datepicker, I heard back from Tan Ling Wee:

Thanks for the compliment on the datepicker. I’ve rewritten the datepicker to make it more flexible and renamed it to Sparrowscripts datepicker, but have started charging a fee of $10 per download (unlimited use though).

Check out SparrowScripts for the datepicker and several other projects you might find useful.