> Such a thing already exists...  It might not be exactly what you envision,
> but it is close.
> 
> I maintain a CP trading list for this group.  Anyone who sends me their
> growing list will be added to the list.  The format allows you to indicate
> which plants are available for free, for trading, selling, swapping, etc.
       True, but perhaps a Web-based alternative, updatable online by 
       growers would allow a more flexible and up to date environment 
       for small-scale trade as well as more extensive distribution -
       if it was flexible enough to accommodate individually offered
       specimens for example, I'm sure a lot of growers with smaller
       collections would get more involved.  
       I know that I have been meaning to send in a growlist in the 
       past - I haven't yet, mainly because I'm disorganized, but also
       because any plants I've got for trade are often only in ones
       or twos when I divide or take cuttings, which don't seem to 
       justify the potential for information obsolescence and confusion.
       I just don't have the space to duplicate specimens to ensure a 
       trading base for many plants, and avoid having to bother you 
       with an update every time I swap a plant.
       I don't know if such a thing is even possible or whether it would
       breach any 'commercial use' policies or anything, but what would 
       be really neat would be an online Forms-based system with the 
       ability to forward Email enquiries/orders to growers, and auto
       update the listed plants accordingly - a sort of cyber-swapmeet
       (Aaargghh! - he said the "C" word :)  I don't know enough
       about the technology to figure whether this is feasible or pie
       in the sky - and of course, someone would have to set it up.
       I'd be happy to volunteer some time and brain cells, though I
       don't speak AWK, and I've not had a vast amount to do with html
       and the mechanics of the Web.
       
       Any thoughts anyone?
              Happy growing,
                       Peter