Hi,
I do not think I have ever seen a thread on digiscoping here.  However, I definitely have seen it done when I was out in Yellowstone.  I think that the general consensus of folks I have spoken to has been that it is still not prime time for folks with SLRs.  As I recall, the folks I saw using it had a compact digicam on it.  I think that there are weight and adapter issues in terms of focus.  
Having said that - I have never tired it myself, nor have I seen any results from anyone who has tried it with an SLR..so I am hardly an authority.  It certainly would be wonderful if it DID work.  It would save a fortune.
If you do decide to try it, I would love to see the samples.
James