Just throwing my hat into the discussion here...I am also a RRT and a RN. Currently working in critical care as a nurse for about one year now and I have to say I have learned so much as a nurse it is amazing, even after many years in the ICU at the patient's bedside as a RRT. But, my respiratory education was much more "technical" in nature and many of the things I learned in respiratory school (hemodynamics, a-lines, intubations, and of course, the ventilator) were things hardly touched upon in my ADN and BSN programs and these skills seem to play a big part in the everyday lives of CRNA's. However, now that I am a critical care nurse, I actually get to put everything together, which is really good. There are hospitals out there where the RT is the one managing the swan, inserting a-lines, and intubating as it is an intergral part of our education and training. Granted, these places are few and far between and I can say from personal experience that sometimes the RT's job can be to just troubleshoot the vent and give breathing tx's, which I feel is underutilization of our training and skills......
Now, to answer your questions Mullis...I am currently finishing an online RN to BSN program and no, I don't think it will matter to the admissions committees as graduate 2002 said, as long as it is an accredited program and as dfk said, keep up good grades, especially in the sciences. I also agree with with dfk that you definitely need at least one year as a critical care RN before applying, to bring everything together. When you do finally face that admission committee, your experience as a RT (plus good grades, work experience, GRE scores, etc.) can only help make you a very well rounded candidate for CRNA school.
Hope this helps,