I noticed IFC.com has a lot of Greg the Bunny videos so I thought it'd be cool to put them up here as well. IFC.com is a little buggy and they don't really do a good job with the descriptions of the videos. Instead, I used the episode guide from this site as a listing.
You should be able to simply click on each of the episodes and be taken to either IFC or YouTube where the videos are stored. In my video section, I've embedded these same videos but with descriptions (again based on the episode guides) for each of them.
I'm pretty obsessed with Warren the Ape and Greg the Bunny and I wish all of the older GTB and Junktape episodes were somewhere online, but alas, I guess some things weren't meant to be totally free (including the GTB Fox series which aren't listed in this post).
I'm not sure why IFC doesn't have the "Blue Velvet" episode when they have everything else. I've written them, but we'll see if they reply. I've also asked them if they could put all of the "The Greg The Bunny Show" episodes on the site. Additionally, IFC has an episode listed as "Sisters" which is strangely absent from any of the episode guides. I put it after "Blue Velvet" and labeled it "A" since I wasn't sure where it's supposed to go.