SP to recycle SQL Server and Agent Error Log file

To limit the size of the SQL Server error log, the sp_cycle_errorlog system stored procedure can be issued to start a new error log. 

To recycle SQL Server Agent log you can execute sp_cycle_agent_errorlog system stored procedure.

Issues with Using Run As to Start SQL Server Management Studio with a Different Login

http://www.mssqltips.com/tip.asp?tip=2164

Download SQL Server 2011 code name Denali

Click on below link to download Denali

http://www.microsoft.com/sqlserver/en/us/product-info/future-editions.aspx