After reading this logic, I guess it is understandable that the links primarily focus on websites that frequently include new content.
One thing that would be cool would be some type of almost-daily things. Like a "Muppet of the Day" (or a few focuses on different characters per week), including a short description, links to the Muppet Wiki and (if the character was spotlighted here) Weekly Muppet Wednesday articles, maybe even link to Henson.com's old "Featured Creature" pages if appliable (you'd have to use the internet wayback machine site to do so). It could be daily (I'm sure it'd take years to run out of characters), or semi-daily. I don't think it should be a "Muppet of the Week" thing (might be too similar to "Weekly Muppet Wednesdays").