I found this place a while back due to a couple friends playing the staircase game (I didn't pay much attention at the time and I haven't yet gotten to that one in my reading so I don't remember what number it was), was re-introduced by my brother a couple days ago, and finally decided to check it out myself. I thought it was just some elaborate hoax site until then. So far in my reading (which is not very extensive yet), my favorite is SCP-682, mostly because of the experiment log. Brilliant!
I do have a few (mostly vague) ideas for SCPs of my own, but I don't really feel comfortable enough with the site yet to start posting any of them. For now, I'll content myself with asking hopefully interesting questions about the SCPs. :3