Also boosting this thread.
That one person who claims there is no demand is just dead wrong.

Many of us are waiting for a true applocker.
It is just a fact that private information is TOO EASILY accessible.Conversations for instance.Even when you do not intend to snoop or be curious ,you can accidently open it and half of your message are read already.

I am not trying to hide secret information about world domination.So no need for a super sophisticated and complicated app with all kinds of whistles and bells that would give hackers (that my nemesis,in search of my world domination plans,recruited offcourse) a headache.
We simply want more controll over private information stored on the n900.
We just want the abbility to put a password on an app for when someone else is using or phone for a very short period of time to lets say..play a game or something.

Many of us are seeking such an app,could someone pls help us out.....

Ok, total newbie on the board but found my way here for this very purpose. Had somewhat of a close-call with a family member (who loves my N900 due to the retro emulators it has) clicking into my file browser out of curiosity. He was caught before he could click into the .private folder but something that could password protect photos/videos would be pretty much the best solution ever...

@rated,

If it's only data (not programs) you care about, you can always set-up an extra partition on your sd card (o a loop partition on Mydocs, whatever) with all your p0rn and mount it on demand.

You want to let somebody use your phone? umount the p0rn partition first.