ACCESS's NetFront is a popular PIE replacement for Pocket PCs. The English release of version 3.2 is now out, including support for WM2003SE, integrated Flash, Rapid Render technology that gradually renders the page, a new Java VM for applets, and some other features. You can see the full list of new features
here. They're also offering a new release discount, as mentioned on the frontpage, linked above.
One downside to the new release is no official VGA support, as was
discovered by PPCT member Menneisyys when the Japanese version was released a few months ago. If you need a fully WM2003SE VGA-mode compliant browser, this may not be your first choice.