I think I need an iPad.
FontBook, now in version 2.0, is the world’s most comprehensive typographic reference tool, containing 110 type foundries and featuring over 620,000 typeface specimens. This 7 min tour explains the main features of FontBook.
Description on their site:
If typography were a religion, this would be the Bible. FontBook is the world’s most comprehensive typographic reference tool, containing 110 type foundries and featuring over 620,000 typeface specimens. Use the FontBook app to look up and view fonts by name, style category, typographical subclassification, designer name, foundry name, year of publication, or by similarity of design. Compile your own list of favorite fonts, and use the “compare” tool to test-drive fonts. Specially designed for fast, easy navigation and also works as a fun playground for finding inspiration.
FontBook is primarily an online browsing application and displays its full content only when your device has internet access through a WiFi or 3G mobile connection. However, if you have no online access, you can temporarily switch the “Include online content” setting to “off”. This will enable the app to display a reduced pool of selected content which will work offline. Whenever you do have online access, you can switch back to the full version by switching the “Include online content” setting to “on”.