Roman Army Talk is a great place to hang out if you're interested in Romans, and it gets even better when the talk occasionally turns to tile :-) Recently, Jona Lendering of Amsterdam, had an enquiry about a tile stamp from Rindern, on the German/Dutch border. What followed was a discussion on what the tile actually said:
Roof tile LEGTFM
Jona was kind enough to thank me for my input (so often people don't bother!) and has put the ideas onto the Arenacum/Rindern entry on his interesting website.