Cypress - Between Whidbey and Orcas
Recently I had been working on VSTO 2.5 codenamed "Cypress", which includes runtime support to enable VSTO 2.0 customisations to keep running in Office 2007. I had been working on the ListObject runtime compatibility of it, to ensure that databound ListObject keeps working in Office 2007.
Apart from this, there are some cool new features which are shipping in this version including application-level addins - one of the features that has been high in demand among customers. These will be supported in Word, Excel, Powerpoint, Infopath and Outlook. There is also some key programming support and Intellisense for Ribbon and Custom Task Panes.
Check out this video for more details.