SMS on Android - a useful app for work/personal cellphones

Since getting an Android phone, I've been trying to find a way to be happy with the SMS function. Each message from SiteSeer and Orion comes in as a unique thread. When we get pages (lots of them sometimes), they are difficult to clean up unless you want to delete all SMS messages. But this deletes your personal messages too. You can use "batch mode" - but you still have to select each one you want to delete, which is not good if you have tens or hundreds.
Now I'm using GO SMS EX, which is a replacement SMS application on the Android market. This app allows you create a filter list using keywords (I'm using "DataNetwork" and "SiteScope"). These messages aren't really filtered - they are automatically sent to a separate folder. So, this allows you to have a separate "personal" and "work" SMS area. Then you can perform functions (like backup and delete) on an entire folder of messages without affecting the other group of messages.