Yes, I miss my Centro too in many respects, notably a really good calendar and a remote-control comparable to Salling Clicker (which the developer is unwilling to port to Android for some reason, but I digress).
------------
#1 is not feasible for Android, given the builtin security mechanisms.
I achieve #2 using ClipStore, in conjunction with an "in-app menu" as follows: First, install ClipStore, which automatically adds things to a clipboard history. Then, setup an app to run when you press and hold the Search button. I initially tried this with QuickDesk, but found this to be brutally slow, so I switched to using WidgetLocker for this purpose. In addition to being a nice lockscreen utility (and alternative home, but I don't use it for that purpose), you can use WidgetLocker as an in-app interface, e.g. when you press-and-hold the Search button. So when I press that button, up comes a screen which (for me) has several icons, including ClipStore, PowerSearch, and a wifi toggle.
So to get to my list of recent clippings I press and hold the search key, then click on ClipStore, and then click on the clipping I want. ClipStore also lets you "register" some clippings, so you can keep a few items handy like a commonly-used email address or some boilerplate.
#3 is pretty well implemented by PowerSearch, and as you see above I have access to this "in app" as well. HTH ...
