I have moved them all over to a new site! From now on, you will find all mashup videos at MashupVids!
As to why, I receive A LOT of content submitted on a daily basis. There are so many great mashup videos that I didn’t want MashupCiti to lose focus of its purpose. To feature fantastic mashup music. Mashup videos are kind of an art form unto themselves, and deserve that kind of attention.