Which Language to use to create Graph Data from MySql?

I have been developing VB.Net Windows Application Utilities to help me process Data from SQL now for about a year, and I would now like to Start using the Web to re-write some of my applications which display Data from MySql Tables. Where should I start? What Language PHP? Python? Javascript?, HTML5? Just looking for a few examples and some resources to get started on the right track?

Thanks in Advance Guys !

Rob