What does openness mean to you?
The discussion on whether open is good or bad is irrelevant. The problem is that the masses have lost the ability to think for themselves. If we take this as a differenciator we find that those people who would rather want the manufactorer of their mobile device to be in control are simply giving up their ability to make decisions by trusting who they consider an "expert".
On the flip side it is not easy to know who to trust. If someone can convince the masses that they have built a application store that can be trusted (good marketing always wins the masses for reference check the status of the food industry) then that individual / organization can take control of user's free choice.
What we are likely to see here is "safe" markets appear for android. Which means that organizations will create processes where they vet apps and certify them as fit for purpose or "safe". I say that in quotes because you can never really be 100% safe. There are always updates, glitches and bugs to deal with. How do you think the iPhone got jail broken. All it requires is that a user trust an app they downloaded and it can replace the OS on the device!
Bottom line is that if you try to make something fool proof you just end up making better fools. This is an old quote and people should be pretty familiar with it. I personally prefer openness. I like choice. What Android means to me is that I have a choice on which hardware I want (small screen or large? real keyboard or virtual? SD cards or no extra storage, flash or no flash, etc.....)
I also get a choice on who I trust to write software for me.
If I use my device for business / productivity then I would not download and install fart apps willy nilly. I have to have some sense. Therefore when the previous poster @wathend says:
"Sure Android is open and fun but for businesses and serious users who do banking and most other things on their phones these days the Apple App Store is the safest as far as Im concerned."
I feel that the point is being missed. If you need safety and you have sensitive data on your device then BE CAREFULL AND DON'T DO ANYTHING RISKY.
I have a daughter and I am very careful on making sure the environment she lives in. I don't control what she does, I make sure that the things around her are safe for her to deal with. This is the mentality most users of computers have not entered where they are the children and the software/hardware manufacturers are parents. Get over it. If you are an adult then take adult decisions on what to do. Learn to understand what trust is, how to build it / give it to others.
Disclaimer: I have an iPhone 3G but I will not be upgrading. I am also a developer and have been developing for over 10 years.
Here is a quote:
Any fool can make a rule, and any fool will mind it.
Henry David Thoreau