Filter Rules for SMS aims to solve this problem by offering software which allows one to set up rules to move software to sub folders
The software features the ability to:
- Create rules for contact.
- Create rules for Message.(manually give a filter to find in SMS body)
- View Created rules
The software is still in early development, and rules have to be run manually, but for people who send 3000 texts a month it is still a godsend.
Read more in the XDA-Developer thread here.