Do Android apps leave behind files and changes once removed?

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I'm curious if the Android OS works like Windows Mobile does. With windows mobile, un-installing a poorly written app (or poorly written uninstaller) can sometimes break the OS from function correctly (thereby making a hard reset the only fix). Sometimes un-installed apps from WinMobile will leave behind files and registry settings. Sometimes these un-installations can cause problems in the future when new apps are installed.

That said, does Android work the same? If I install 10 apps and remove all 10 apps will everything be like it was when I first got my phone? Or will some traces of that app be left behind (potentially causing more problems in the future)?

It took me years to finally settle on the Windows Mobile apps I could depend on and enjoyed using. The biggest problem with WinMobile (for me), was that installing a few "new" apps that I haven't used before often lead to problems forcing me to hard reset, re-configure, and re-install all the good apps I relied on. I'm hoping Google did this right making sure that when apps are removed they are completely removed from the device with no traces left behind. As long as they do it this way, there should be almost no reason to every hard reset the phone and also no reason not to try every app that looks even remotely interesting.

So... does anyone know?

I have had the phone for a week now and have installed and unistalled many apps from the android market and other sites. So far I haven't notice the programs leaving anthing behind. What is nice is if a program is acting up you can force close it with out crashing the whole phone. Its probably to early to say exactly though.

As far as I know if it doesn't request outside access to the filesystem all the writes are done within a simple archive, which is deleted upon uninstall. So no, should be no trace.

I did notice it leaves things on the memory card thou.