One of the most called-for features in Springpad is finally here: now, if you install their Chrome web app, you can get offline access to all your stuff. When you first log in using the Chrome web app (make sure you use the shortcut to the Chrome web app and not springpadit.com — they'll lead you to two different places, even though they look the same), it will sync all your stuff to your computer, after which you can access it even when offline. If you edit any of your stuff while offline, those changes will be synced back when you log back on.
There are a few things you can't access offline, like adding new items with the search tool, alerts and some sorting options — mostly things you wouldn't expect to be able to access offline. Hit the link for more info.
Access Springpad When You're Offline [Springpad Blog]