None that I know of...
I run a media production company, and I've got a very basic media "workstation" on my topaz already - a mini Photoshop (pocketartist), a mini Cubase (meteor), MS Office, several audio capture and editing programs, but there are 2 things I need to make draft versions for clients on the move. A simple html editor, although I can use Notepad, and a simple video editing program.
The only thing that I've found was the software you also found. It looks quite capable for simple mockups, and is reasonably priced, but was let down by the lack of wvga support. I did email them to ask about this and they said they'd have it sorted sometime in July!
But if anybody knows a good alternative, or decent html editor, I'd really appreciate a nod in the right direction.
On another note, I am still amazed every day that I can have all this software on my everyday phone, that only a few years ago was unthinkable. I can sit on a train and do what I do in the office, with music playing too!