Can we distribute a "portable" application? (Ie. Zip file that just extracts and works from there).
"We"? If you want to submit a patch with the relevant changes, I'm sure the dev's will be pleased to review it!
But seriously, yes, a portable version is something that has been requested a few times, and it is something we may well consider in the future.
Portable would be cool...not sure how hard they are to make? As tech. increases probably going to become less and less necessary in most developed countries (due to ubiquitous internet) but will be useful in developing countries for some years to come.
Someone has contributed a patch to add a "--portable" command for OpenLP 2.0, we're just waiting for them to sort one or two things out before getting it into trunk.