Probably the coolest new feature in 1Password for iOS 4.1 is support for URL schemes. This means you can do some pretty awesome stuff, like automatically opening the current webpage from Safari, Chrome, or another iOS browser in 1Password’s Web Mode for form filling and Login-ing goodness. All you have to do is tap in the URL bar, add ‘op’ to the very beginning, and tap Go/Return to make the switch.
The latest update to 1Password adds support for URL schemes. Viticci already created a clever booklet for it, but I've gone for a more direct approach. I added some webclips on my iPad which link to ophttp://someurl as a way to quickly launch password protected websites in the 1Password browser.
I've attached a .mobileconfig file as an example: the file contains four webclips for Facebook, Twitter, App.net and Gmail.