Is Summerboard part of the ZiPhone jailbreak or is it a different application? And then I need the theme correct. I am sure once I actually start this process it will be easy. I am just trying to be careful
after you jailbracke your phone you`l have a new application on your phone called installer, open that and search there for summerboard and install it and then, you have a category in installer called summerboardthemes and you can download them from there
To be generic, if you search for how to jailbreak (there are tutorials on this) and search for how to customize, you'll know just about everything on this topic. If you want to get into some crazy customizations, search for how to SSH into your phone.
If you run into problems, PM me. But it really is way to easy to explain it every time someone new gets an iPhone.