Hi all,
I'm an absolute beginner at ereading so please be gentle with me if I ask dumb questions
I don't have a dedicated ereader such as a Kindle etc. but may consider one in the future.
In the first instance I want to use my android device, a Samsung Galaxy note (when I get it).
A windows 7 PC, A Linux Mint Laptop and possibly a WM7 device as well with the possibility of a Kindle later on.
I want to be able to by my books from any source available (i.e. I don't want to be tied to Amazon/Kindle store) and be able to use the ebook on any of my devices (I don't mind paying for a book but I want to be able to use it when and where I want to).
My first leanings are towards Calibre as my cross platform manager but I'm at a bit of a loss as to which reader app is best for which platform. Obviously it would be good if I could settle on one app that works cross platform but not sure that's feasible.
Any advice on apps, ebook format of preference etc. greatly appreciated.
I've read so many threads here and elsewhere that my mind is awash with different apps and formats that I can't see the wood for the trees at the moment.

Any advice appreciated.
Regards
Clive