I find eCrush cute but potentially entangling. It has a system (also in use at theSpark) where you enter your crush’s email, and they receive a note telling them someone has a crush on them. They can ignore it, or go to the site and enter their own crushes, thus dragging in more and more helpless users.
Of course, their system could always be abused to hunt down one’s secret crush so you can tease them mercilessly. Let’s say i recieve a crush note from the site, and it was sent because Girl#1 has a crush on me. I’m not entirely sure who has a crush on me, so i enter in the email address of everyone i know, hoping that i find out it’s someone hot. Instead, i find out Girl#1, who is rather fugly. I wait a day to let all the crush-notices generated by my entries go out (in case i find someone else who likes me), and then I send all my other friend’s an apology, saying i was hunting down my secret crush and had to enter them all in. Ta-Da! And easy and effective way to find out just who digs you without any commitment!