I had the same problem last night. This is with iOS 4.3 and Atomic Web 5.5.0.
I tried turning the iPad off, then back on, and the problem persists.
I tried various web pages and they all make Atomic Web close. Doesn't matter how simple or how complex. Even Google's home page will crash it.
I tried transferring them over to GoodReader via DropBox, and the .webarchive files make GoodReader crash too.
One workaround I did find is if you copy the URL, then use the 'Download File' function, you can download and save the page there. That works, but it saves HTML only, no pictures. Be sure to add the ".html" extension in the save name, else it doesn't know how to display the download, and you get a cryptic error message "Unrecognized file - The extention '.' is not supported for viewing in the browser"