There are open source applications for Windows that install easily via setup.exe files, so you're a bit off there, but I get your meaning. Certainly, there are some applications for Maemo that take a bit of work and command line magic to install.

Keep in mind though that the hard-to-install applications are over represented in the troubleshooting discussions here. Regardless of their license and regardless of their platform, applications with complicated, finicky installation processes lead to troubled, frustrated users who need help.

There's an ongoing--and quite successful--effort underway to encourage developers to upload all their Maemo applications to a single location: the maemo.org Extras repository. For the large and growing list of applications there already, installation is as simple as opening Application Manager on a tablet, browsing for an interesting app, and tapping "Ok".

Maemo Mapper is in Extras, so it's an easy install from the Application Manager.

As for aMSN, it looks a bit more complicated, but hopefully the instructions in the aMSN forums will be enough to guide you through the process.

1. Launch the Map application on your tablet.
2. Open the Map application's menu.
3. Tap "Maps" in that menu.
4. Tap the "Available maps" tab.
5. Select a map.
6. Tap the "Download" button.

1. Open a web browser window on your Windows computer. (I'm guessing that's what you use as you mention "setup.exe" installers.)
2. Go to http://www.nokiausa.com/A4686323#.
3. Download the Nokia Internet Tablet Software Update Wizard.
4. Run the easy installer for the Nokia Internet Tablet Software Update Wizard.
5. Run the Nokia Internet Tablet Software Update Wizard and follow its instructions.

Your tablet will automatically check for any updates beyond what you install via the Nokia Internet Tablet Software Update Wizard above. If and when it finds an update, your tablet will flash an icon in the status area of its screen. Tapping that icon will lead you through the process of installing the update.

Any updates to Flash will come to your tablet via the update process above. Adobe does not make updates to Flash on Maemo available on its web site as it does for other platforms.