I only recently heard about these. I just ordered mine, will keep everyone posted .
Like they say in the video, there's no practical reason for it, it just looks cool. Maybe a bit geeky, but I like them (especially on darker wheels from stock SpecBs to black). They even do logos, eg Subaru logo .
'Liberty.asn.au' is probably a bit too long, unless you want the letters to go around half your tyre. Just 'Liberty' might be ok but a bit boring imo. So I went with the Subaru logo and a single Tracer stripe for each tyre.
I don't really see the point of having your tyre manufacturer on there. Maybe for something exotic like Pirelli PZeros, but l just have Bridgestones (although they're fantastic, that's not very cool). And I read somewhere that they can't do lettering that says 'Bridgestone' - something to do with trademarks I guess. Maybe Bridgestone lawyers weren't happy (other manufacturers seem fine with it).
http://www.tredwearletters.com/
http://m.youtube.com/watch?v=GwYl-5sqkUk