Isn't there an app you can get through Cydia that lets Safari browse local files? I haven't tried it myself but I remember seeing one in there. I imagine you would find it if you search for "safari" in Cydia.
Also, most of the file storage apps available from the App Store allow you to view html files that you copy onto the iPod through them. I never did find one that I liked, but one of them might work for you.
Also, Instapaper or one of the ebook readers might suit your needs too, if you just want to read the text and can do w/o the graphics.