Métro - Public Transport on Smartphone

There is a clever "little" program for PDAs and smartphones that lets you orientate yourself in the public transport networks of many cities. It's called Métro and is available for free. You install the program and then install the databases for the cities you need it for. I've installed it on my phone (Nokia e71) and played around with it. Basically it tells you how to get from point A to point B in the maze of an unknown city's public transport net.
The program itself works fine, even though some of the user interface is a bit counter intuitive to what I got used to on this Symbian phone. The Athens Public Transport information is limited to the Metro/Treno lines, the tram, the "suburban railway" (προαστιακός) and the trolley lines. Missing are all the bus lines - which constitute probably 80-90% of the public transport network in Athens.
This limitation is probably due to the stated limitation of the Métro software, which on their site is given as "when a database contains more than 80 to 120 lines, trouble is looming". This is quite understandable, since many variations of the software have to run on limited hardware.
So, is the software still useful for visitors to Athens? If you're a tourist, probably yes. Most tourists are overwhelmed with the Athenian bus system anyway (ok, the "Métro" software could well change that with bus line info) and stick to the Metro and tram lines. In that case Métro might save you some studying of line diagrams and help you plan your tours to visit the tourist spots. Or it might help you reschedule your excursions on the spot when you feel like it. If on the other hand you want to explore Athens in depth, the ΟΑΣΑ site and pdf transport maps will be a better, but much more tiresome resource.