I recently switched hosts for Think Before You Think from Smack Jeeves to Spider Forest. This was an upgrade, since Spider Forest is a selective collective with free domain hosting, but I think Smack Jeeves is underrated, as a free and open webcomic host.
I started with Smack Jeeves when I was making Lifehouse: Behind the Video Blogs. I didn't know anything about running a webcomic. I had been posting my comics in my LiveJournal art gallery. With Smack Jeeves it was easy to get my comics up in a sequential order, which was all I wanted at the time. I didn't need to know any html in order to do that, but since I had access to all the code in the layout for the default template, I decided to experiment with it, and I learned a lot more about html through that process. And I discovered that I actually have a lot of freedom over the structure and layout of the website.
In general, I've been very happy with the features that Smack Jeeves provides for free, and when I wanted something improved, sometimes posting about it on the forum would make a difference. For example, I got them to include news in the RSS feeds from my suggestion.
I still update my original Smack Jeeves-hosted Think Before You Think website as a mirror, and still get a significant portion of my website's traffic from it, because a lot of Smack Jeeves members have it in their favorites. I think the pool of Smack Jeeves comics sometimes has a reputation for being juvenile or nothing but Yaoi and sprite comics, but I think it's pretty diverse. It's a huge website, and since it's so easy to use that it has a lot of comics on it that people don't put much effort or care into, but it also has a lot of good quality comics. I was impressed that my comic got such a big following of fans on the site considering that it's not in any typical Smack Jeeves genre.
I highly recommend Smack Jeeves if you're looking for good quality, free webcomic hosting. I might even recommend getting a premium account if you want to have your own domain and you want to spend some money. But I don't know what that's like - I haven't used it.