As Ali works on tactile feedback it was very interesting to see the presentation of Kevin Li on eyes-free interaction. He has an upcoming paper at UIST 2008 which is worthwhile to check out . It was interesting some of the questions that relate to "easily learnable" or "intuitive" related to the discussion we had 2 weeks ago at the automotive UI workshop - what are tactile stimuli that are natural and we associate meaning with them without explanations or learning?
There are many more papers to read if you are interested in tactile communication and output, here are two suggestions  and .
. Li, K. A., Baudisch, P., Griswold, W.G., Hollan, J.D. Tapping and rubbing: exploring new dimensions of tactile feedback with voice coil motors. To appear in Proc. UIST'08.
 Chang, A. and O'Modhrain, S., Jacob, R., Gunther, E., and Ishii, H. ComTouch: design of a vibrotactile communication device. Proc. Of DIS'02, pp. 312-320.
 Malcolm Hall, Eve Hoggan, Stephen A. Brewster: T-Bars: towards tactile user interfaces for mobile touchscreens. Mobile HCI 2008: 411-414
PS: Just one remark on the term "framework" (a favorite word to use in dissertation and paper titles) - it is not a clear term and expectations are very different, hence it make sense to think twice before using it ;-)