There are (please don't be surprised by this, it would be really depressing) a huge number of applications available for S60-powered phones like the N95 which use network connections. In fact, even ebook readers can go away and talk to their own stores.
So it can be quite tedious to have to tell an application which connection you want it to use, between the mobile network and any local WiFi networks, every single frigging time.
And there is one, that's one application which handles this intelligently. Shozu. Specify connections, tell it which to try first, and it will then work it's way through the list. Which means that if I'm within range of an accessible and free WiFi node, I won't have to worry about getting slugged data charages.
Can't everyone else work this out?