text mining: ttda

Hi, 
I am working on a text mining project and i am interested in ttda
package. however, I really cannot find the document for this package
in English.
Can anyone give me some help? btw, is there any other package in R
doing text mining. I googled MedlineR which might help my project.
Anyone can give me some links on how to use it too?

thanks,

Weiwei Shi, Ph.D

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III