How do you get the zip files on to your iPod if you haven't jailbreaked it? That sounds exactly like iComic actually, but you can SSH them on to your iPod. When a page's resolution is too big it will just be a black screen with oversize written on it. But, I've read a bunch of comics and I've only had that show up once and it was only the comics cover. The only converting I've had to do is changing rar files to zip files. But, Comic Zeal sounds like a good option for a person who doesn't want to jailbreak.
I heard about Fring, that looks awesome. I only have an ipod touch, but that's a great app. The market for phones without contracts is going to be huge now even though you do have to be around wifi. In Minneapolis, they have citywide wifi and I've heard (but I'm not positive) that your signal never drops, it just changes from one wifi spot to the next one. So, a unlocked iphone with Fring might be all a person needs if they spend the majority of their time within the city. Unfortunately, I'm about 10 miles out of range. I've never used Skype, can you take incoming calls with it?