I've noticed that if you click on a picture of a character, as seen at the top of the page, the first sketch listed automatically plays, but if you just type in a keyword, the first listed sketch doens't automatically play. This is bad if you are watching and searching at the same time. I've forgotten about this a few times when I've clicked on the character pictures, and what I was watching suddenly swithced to the first sketch listed.
It seems like there's only one clip that appears if I type in "Simon Soundman", but if I just click "Simon", there are a few more clips.
Tough Pigs currently has an article about this website. It points out that the site currently doens't have anything with Roosevelt Franklin, Don Music, or Sam the Robot, thinking that maybe Sesame Workshop doesn't want to show clips with discontinued characters (but then while there is no Don Music banging his head, there's Alistar Cookie eating his pipe?), but the site does have clips with plenty of discontinued characters, like Sherlock Hemlock, Placedo Flamingo, Forgetful Jones, Herbert Birdsfoot, and The Salesman.