These are the folks I follow on Twitter because they know SharePoint so very well. They are in no particular order. I just pulled them from a list I have on Twitter.
Joe McShea @joe_McShea
Independent SharePoint consultant, author of SPEasyForms – open source tool to apply jQueryUI customizations to SharePoint forms through a drag and drop UI
Amie Seisay @AmieSeisay
Speaker and SharePoint Developer
SharePoint Shepherd @shareshepherd
The official account of the SharePoint Shepherd
Bill Otremba @BillOtremba
Regular member of the Baltimore SharePoint User Group
Typing all of these out will take forever, so I need to make my list public. Grrrr. Here.