Alright so I have been seeing many posts lately in regards to issues when trying to edit data view web parts in the datasheet in SPS 2003 after applying SP3. Just to let everyone know this is a known issue that has been escalated to the product team. Based on the results of their investigation a hotfix or workaround will be published as soon as possible. In the mean time if this is causing issues in your environment that require immediate relief or attention please open a support case and have it escalated with Microsoft Support. To open a support case you can use the following link to start the process: https://support.microsoft.com/oas/default.aspx?gprid=11373

**Update** The hotfix for this issue has been released. You can find info here: http://support.microsoft.com/kb/943167 **Sorry it took so long to update this, I had assumed I already updated it until I noted the comments! Thanks all!**