Ok I have very few items installed on my phone currently. I have the 2.2 FROYO and the my apps list for the market says I only have 1 item installed. It consistently tells me I have YouTube installed which is fine. I am missing all my other apps though 90% of the time when I check.
I can search the market for an app I know I have installed such as Google maps. It will list Google maps as installed and street view on Google as installed.
Go back to my apps and it still only says YouTube. **bleep**.
I will post if I ever find a pattern when it actually displays the correct list for my apps, but the easy one is the incorrect since it happens so often. I have an old habit of every morning visiting the market and seeing if my apps says there are any new updates. I decided then if I will apply any updates or wait till later that or the weekend. I know the new auto update feature should make this a thing of the past, but due to other issues with my phone I am not ready to blindly let it update apps for me. I am trying to figure out if an app is to blame for any of my issues.