When you're on my.foxmarks.com, don't forget to add it to your iPhone's home screen for easy access in the future (click on the "+" button, and then select "Add to Home Screen").
Just so you know, we are also exploring a version of Foxmarks for Safari. A Foxmarks iPhone app that syncs all of your bookmarks over the air is also a possibility, so stay tuned.
By the way, we realize that the iPhone is not the only mobile web browser in town. my.foxmarks.com will also auto-display a mobile version for other phones too. Give it a try and let us know how it looks.
Check out Lifehacker's coverage of Foxmarks on the iPhone.