I know that Steve Hochberg at Elliott Wave International is calling a top near here,
and here are two other sites talking about tops:
The second guy is using Fibonacci Time ratios, which are occasional useful, but I have found them too infrequently to be generally usable. They can work, however.
My trendline work suggests that both the $NDX and the $SPX have the right characteristics by my system to be at a top, we'll see what Monday brings....