Hi I’m author of Tasko, an online task management tool which uses a plain text file format to store all the information.

http://taskodone.com/
http://taskodone.com/about

I think the concept of Tasko can appeal to many people who are exhausted to use troublesome task manager.

I personally uses it as main GTD system. (using tags for context mechanism of GTD)

Please check it out, let me know what you think : )