WordPress version check provides you with highly visible in dashboard notification of new WordPress releases and has an optional facility to allow you to be sent an email each time the update message changes (For more info see: http://blog.ftwr.co.uk/archives/2005/07/27/wordpress-version-check-v090/).
The follow changes have been made in v1.00:
1. Added support for WordPress v2.0-RC1
2. Added timeout to XML-RPC calls.
Go here to download: http://blog.ftwr.co.uk/wordpress/wp-version-check/