Having issues with applications from the Market not downloading, or stalling during installation? There's a fix that might help, and we've detailed it in the forums. It's not complicated, doesn't require root or any real hackery, and we've even covered the method to make the fix stick so you aren't doing it every time an application wants to install itself to your SD card. It all circles around the .android_secure folder on your SD card, which is the place applications using the "install to SD card method" that comes along with Froyo want and need to be.
Hit the forums and have a look, because even if you're not having problems now, you never know when they might spring up. [Android Central Forums]