Wisconsin's Reading Specialists Association (www.wsra.org) is hosting a series of workshops with Peter Johnston of SUNY-Albany and Richard Allington of Univ of TN this summer and through next year. Both are strong critics of RtI, but neither appear to have any direct experience with RtI implementation. You can listen to Allington at:
http://www.reading.org/downloads/podcasts/II-Allington.mp3
It's interesting that the strongest criticisms are coming from reading which has been such a political area for so long. I guess it makes sense.
The issues seem to center around use of running records for progress monitoring and the requirement for evidence-based intervention. Wondering what's up in other states/areas.