Polyrhythms such as those are pretty common
Colorbox (just to name one off the top of my head) uses lots of those
There are a lot of 3/4 psy trance songs...I remember Tandu having one on multimoods (oops just read above!); Total Eclipse also has a few...I've heard plenty though
Ishq's last album had some odd times I think...but...well...I dunno its not really "beat-y" although it does have a beat
If you want odd timed electronic music, IDM is the place to look
Check out plaid, autreche, boards of canada, funkstorung....for starters
these groups use a good amount of odd timing in their songs
pink floyd has some songs (most notable: money)
Not so electronic: meshuggah!!! frederick throdendal's special defects is also rad with a much more "electronic" sound, and of course dream theater, they use cheasy synths sometimes, so theyre sorta electronic