As mentioned in a post previously, it is possible to make your iphone apps run in iPad native resolution by modifying the Info.plist file of the application. There's a brief description on modmyi.com but it doesn't go into much information.
I've tried the trick on Beejive and it worked perfectly. Also did the same thing on iPeng (the brilliant squeezebox controller) but sadly, although it ran in iPad native resolution, some of the buttons at top and bottom don't work.
It is all very promising though, and hopefully means that when we get iPad specific releases of these apps there won't be too much of an "HD" tax applied for those that are trivial to convert.
For those that want to try it, I found the following approach worked well:
Install and launch iPhone Explorer.
Using iPhone Explorer, navigate to the app on the iPad - it will be under /var/mobile/Applications (you may need to change your root path). The folders under there will look like a load of hexidecimal numbers, but if you expand each one you'll see the name of the app in there somewhere. You then look for the Info.plist file within the specific app directory and drag it to your desktop. You then need to edit the binary Info.plist file. I find it easier to do in a text editor so first convert it to text (via command line - cd to Desktop):
plutil -convert xml1 Info.plist
Edit it using your favourite text editor.
Add the following to the bottom of the file but BEFORE the </dict> line.
<key>UIDeviceFamily</key>
<array>
<integer>1</integer>
<integer>2</integer>
</array>
Convert it back to binary
plutil -convert binary1 Info.plist
Drag the file back to the same folder on the iPad. You can simply drag the file from Finder into iPhone Explorer.
I found that I had to do a reboot of the iPad before the changes came through, but so far it works very nicely.
Combined with Backgrounder, the functionality of the thing has increased substantially.
Well, I couldn't get this to work with Beejive no matter what. What happens is now the app is entirely gone from the iPad. Weird!