Here's a great idea for iPhone users starved for offline content. Filemarks, a free droplet utility developed by Jamie Wilkinson, builds a bookmark you can sync to your iPhone (via Safari 3 on your Mac or Windows PC) that can contain hi-res images, PDFs, or other data. It's a free download and seems to work really well. A brief description of the utility from the Insanely Great News web site (co-authors of the droplet and makers of some fine t-shirts) reads:
Filemarks let you store high res images, text files, and PDFs on an iPhone! There aren’t any good ways to do this with the built in Apple tools - you can use iPhoto to copy images, but they’ll be scaled down and become unreadable. If you want to read a pdf on your phone, you have to either email it to yourself or browse to it in Safari. Filemarks store your file’s data inside a bookmark. When you want to view your file, you open the bookmark in Safari on the iPhone and you can view it, whether your phone is online or offline.