Now, my system is running nmon2rrd 17a nicely and I'm very happy with features it provides and in general. However there is popped up one slight annoyance. Graphs are drawn with rather fat pen. I haven't looked into the source yet, but I think it's using LINE2 or LINE3 in rrdtool graph. Its better to use LINE1.
Nigel, could you make new compilation when you have time, please.
PS. (Mar's Law) Everything is linear if plotted log-log with a fat magic marker