Path Tracker 1.1 has been approved by Apple and is available trough App Store now. The author warned us to use Path Tracker 1.0, but as it seems, 1.1 is ready to use.
Unfortunately, the most interesting features like GPX and KML export are yet to come (in version 1.2, which has already been submitted to Apple). Still, I'm going to have a look at it and I'll see what it can do and what it can't. So, stay tuned ;)
Update: I'm sorry to say so, but Path Tracker isn't worth it, not even in 1.1 and not even at its price. That Path Tracker will only track while the phone is not in sleep mode (the screen lit) was kind of obvious, but beside this, the application keeps on crashing... so, let's wait for 1.2, which, according to the author, has already been released to Apple for approval.