Good site to look up professors?

<p>Hey everyone!
i am transferring to penn this fall and i'm wondering if there's a site where students discuss professors so i know which classes i should and should not take!</p>

<p>also to other transfers:
did you start signing up for classes? when are we supposed to? after we meet our adviser? since i'm still not too familiar with penn's grad requirements.</p>

<p><a href=""&gt;;/a&gt;&lt;/p>