I have a commuting bike I've had for a few years, and as long as I've had it it's frequently broken spokes on the front wheel. Eventually I got sick of replacing them, put it down to a bad wheel, and replaced it with another wheel I had lying around. This second wheel is a decent Mavic touring rim on a Shimano Deore hub, and it's done a couple of years of trouble free service on a previous bike. Anyway, within a couple of months I got my first broken spoke and now it's the same pattern as before. Each time I replace I true the wheel up carefully and then check it again after a couple of days.
Over the last 20 odd years on several bikes I remember very few broken spokes- once on a loaded tourer, and maybe one or two MTBing.
So my question is this: Is there anything about a particular bike that might cause a lot of broken spokes- maybe forks slightly out of true or something? It's a single speed with a reasonably high gear (45x16) and I am frequently out of the saddle but I can't think this would be any more or an issue than climbing hills on my road bike.