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The Parallax serial LCD is emerging as the display with the smallest pin requirement, meaning it's the odds-on favorite for permanent deployment (inserting it temporarily for programming). There are two alternatives for having two tx pins:
1. Hardware. Obviously the mega can do this, but the mega isn't optimized for deployment. There may be another small board with 2 serial ports (such as the micro), but I haven't found it yet.
2. Software: There's a set of libraries called Software Serial, but since most of the community is complaining about the performance -- so I can only imagine how you feel about it. To me it sounds like a non-starter.
Third alternative would be a different LCD module, one that supports communications on a single pin via an interface other than serial. OsePP, Adafruit and others make them. They all use their own custom libraries which may or may not be optimized, so this also might be a non-starter.
What are your thoughts?
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