We all have fond memories of NTP, don’t we? That’s right, those guys who sued RIM for patent infringement last year, and eventually settled? Shortly thereafter, they moved on to Palm. Well, now they’ve turned their sights onto major U.S. carriers AT&T, Verizon, Sprint and T-Mobile, armed with grievances of the wireless e-mail patent flavor. The lawsuits were filed in a Virginia District Court on September 7th., and will prove to be yet another long, drawn-out legal battle. Man, these guys have got some cajones, going after industry giants like that. NTP doesn’t do much beyond sit on patents, which is clearly proving to be a lucrative business.