USB/IrDA bridges are defined in the USB 1.1 standard, so they (should) all work with Apple's built-in driver (AppleUSBIrDA.kext). For connecting to the internet, you can just use the network control panel to configure the phone's modem, and all should work.
Copying other things like addresses, ring tones etc. needs software specific to your phone, which may or may not be available (or you could write it yourself!). All the low-level communications work is still done by AppleUSBIrDA.kext.
The reason TV and other remote controls don't work is because they don't use the IrDA protocol. IrDA is a nice, well specified, standard protocol, and if anyone made a TV with an IrDA remote, you could control it from an IrDA-equipped mac. But TVs use their own (older and much simpler) protocols which are totally incompatible.
Barney.