The following is a summary of the releases of Roll20 updates, along with a link to the forum post/full changelog for each.

May 14, 2013

• Card decks were improved, with additional options for how cards are played to the tabletop, new hand management display, and a discard pile.
• The API was further improved, including state object persistence between play sessions and the ability to create new objects

Full Changelog

April 30, 3013

• The Roll20 API was introduced
• The Roll20 Wiki was unveiled.
• New features for the Journal including tagging + searching journal entries, drag and drop re-reordering of attributes and abilities, players can edit Handouts, and more.
• Custom turn order entries
• Hide the right sidebar
• Macro and abilities editor made easier to use

Full Changelog