I use N1MM with MMTTY. Integration is very very good... as MMTTY decodes and shows calls on the screen, it color-codes them (dupe, new QSO, new mult) based on whether they are in log or not.
In WAE RTTY, it was even better, and I did lot of QTC's (traffic exchanges) reception with mouse clicks from MMTTY decoding straight to the N1MM QTC form. And QTC sending is completely automated with N1MM and MMTTY.
I used skimmer spots to my advantage too, in RTTY Roundup. Other contests I don't use spots. The reversebeacon network is showing many RTTY spots, and others swear by DL4RCK skimmer spots on RTTY.
AA5AU has some very excellent web pages, and is the RTTY contest expert and has a lot of info on Writelog for RTTY tests. See: http://www.rttycontesting.com/tutorials/tutorials.htm