I think the jock ferret from that guest strip is the absolute best character in the series! I hadn't laughed so hard in ages!
Other than that, I discovered that I have the hots for Ashleigh when I clicked on the 2012 April's fools page, found there was one Ash comic for 2$, and hurried to buy it just to realize what an airhead I am.
My favorite part of the comic is when they climb the rock wall, I love wall climbing! I would die the happiest with a bonus alternate comic in which Ash doesn't fall off so abruptly, reaches the top, and turns to Matt with a defiant pose, before realizing she left something on her way up. Embarrased girls are definitely the cutest!
Also, I think it can't be good for me that I recognized every reference in the files Matt downloads from his computer (though I personally haven't checked any of them).