If you search Cobra's daily posting, you would find out how he define a range or trend day generally. I have no idea about them, just to make general statement about DT.
PPT, black,etc. are also good source. You would find out that most of active guys in cobra's daily posting have a daily job surprisingly.
老蛇is sad now (just kidding). His daily posting is good for DT, IMHO. Don't remember when he started, but once he started, everyone has loved it thus far. Have you tried some individual stocks? Someone said here that DTers love high daily volatility.