There are many things that I want that shouldn't be apps developed by people. I want them in the Android OS. Some wishes are also for the sake of developers.
In order of importance:
1.) Install/run apps on SD card
2.) Task Manager
3.) Flash player
4.) Ability to close an app without continuously pressing the back button (like the Market for example). I would recommend/hope for holding the back button to do this.
5.) Ability to set music volume and ringer volume at the SAME TIME/SCREEN
6.) Give developers access to lock screen (for apps like Android Found and Owner)
7.) Store Contacts on SD Card or SIM (especially if bug #1 on my next list isn't fixed)
8.) Let developers code in languages besides Java. C/C++ is faster, and I love speed :-p
9.) Ability to delete Amazon MP3
10.) Better Bluetooth (file transfer, etc.)
11.) Speed dial
12.) More than 3 screens
13.) Ability to move around applications that are in folders on the desktop
Things I want changed/fixed:
1.) Syncing - I don't know about a lot of syncing, but I do sync my contacts with GMail, and I can say that half of the time I have no contacts and I have to resync. This is a major bug and needs to be fixed. What happens when I have no internet and no contacts, stranded somewhere?

2.) IM - PLEASE give us AIM that works. The constant signing off, slow speed of signing in, no away messages, etc. Come on, Google!
3.) Maps - Fix Street View. I want to search for addresses while in Street View. If I'm not in Street View, I want to be able to search for an address and click a nice button that will show me that address in Street View. ALSO! Maps really sucks at finding "My Location". It's not like I live in the boondocks either. I live in the NYC metropolitan area. "My Location," with GPS on, points 3-5 streets away from where I am. Right now it's actually showing that I'm a good half mile away from my house. This is not the case, as I am typing on my desktop computer -_-
4.) SMS - When I type in someone's name, I want suggestions to pop up. Most of the time nobody shows up, sometimes a few show up, but not all matches, and sometimes emails show up instead of phone numbers. FIX THIS! (please

)
Options I want added:
1.) Auto-flip orientation for built-in apps and for home screen.
2.) Pin code lock (I like the pattern lock, but some may not)
That's all that I can think of right now. It might seem like a lot, but honestly I think that all of this stuff should be added/fixed. I think some of them are ridiculous (no speed dial?? no SD Card apps??). The bugs that are present right now are just terrible.
I'm getting sort of "sick?" of people wanting developers to come out with apps for things that should be included with the OS. I could understand that, but only if Google came out and said that they would never update certain things. Besides that, developers develop apps, and Google gives us our OS.
Besides all that crap up there, however, I LOVE MY G1!
Gerard