Exact duplicate:
i am a sql developer and i use sql 2005. i want to now to pass to 2008 but i am a little affraid. can anyone gives me some advices about this. should i still continue using sql 2005 or is better pass all my projects to 2008 due to better performace?
Who is going to use your projects; if they are going to customers with existing SQL Licenses then 2005 might be the way to go; assuming they are running 2005. SQL 2005 databases will work on 2008; though if you use some of the new language features in 2008 then the SQL2008 databases wont be backwards compatible to 2005.
If you are controlling where they are going to be deployed; some of the new features in sql 2008 might be of interest; better full text search, improved Analysis services, reporting services and some language tweaks. If you are managing the servers; your admins will likely appreciate the new management features in 2008.