I've never seen a list for something like this, but I imagine it might correlate with the programs housed within medical centers that have well-known cancer centers. So I'd think that places like MGH/BWH/BID, Duke, Michigan, Hopkins, Vanderbilt, Northwestern, Stanford, UW, Sinai, UCSF, Wash U, UT, OSU, etc. would be on the list, as you'd be more likely to get good heme/onc exposure at thest places, know good heme/onc faculty who can write some letters for you, and be more likely to have done heme/onc research as a resident. This list is by no means exhaustive...I'm sure we can think of other places too...but it's a start I guess. But more than anything, I'd imagine it's important to go to the most reputable training program where you'd also be happy, as reputation and thus perceived quality of training seem to carry a lot of weight in this process.
For a list of the US comprehensive cancer centers, check out the NCCN site here:
http://www.nccn.org/members/network.asp
