If not, that's OK, and hopfully you won't waste too much time. But if you do discover something useful, or, even better, something new to be interested in, then my ego is boosted. Include a description and a suggested category, if you like. Otherwise I will figure it out myself. Your site crashes my browser, seriously mis-behaves with older browser versions, opens lots of windows, or is filled with so many large graphics and multimedia items that it takes too long to load.
Objectionable content is another reason for rejection.
Sometimes people submit an URL with a typo that I cannot figure out, then don't respond to my e-mail reply asking for a correction. My site is listed, but the description or category doesn't seem right. Send an e-mail suggesting a correction for the description or the category. Yes, if it fits the intent of more than one category it can be listed in several. If the answer is easy, or the question can be researched without too much trouble then you might get a response.