Your photos are really quite good. I imagine you'd have some success selling most of them on stock sites if you aren't already?
I haven't tried yet actually, I've been thinking about looking into putting them into Getty through flickr but I've not looked into it much yet at all. Does anyone on here use any stock sites I should have a look at?
I've been on shutterstock and istockphoto for a few years but haven't been active as I got a bit disheartened due to relatively high rejection rates. However a few weeks ago I logged in to shutterstock out of interest to see how the 20 images I'd put up had faired, and saw one I took on an away day had been bought by someone with extended rights for about $30. This prompted me to try again so I picked a dozen photos and uploaded, expecting maybe 10 to be rejected. Instead nearly all were accepted, with the ones that didn't make it, only rejected on the grounds of them having loads of that type already.
Since then I've been going through my flickr stream picking out photos and have been on a lengthy process of uploading and tagging photos on 4 websites. Acceptance rate is about 80% overall. I'm not sure how much is down to improvement in skills, how much is down to the exif data saying I have a better/more expensive camera, and how much is down to different standards (I've been surprised at some accepted(and rejected) photos).
I get the impression that it's something you need a portfolio of a few hundred images at least to expect any kind of return, which is quite a lot of time and effort, but I guess once they're up it costs nothing, and if it means a cheque for $100 every year, why not? I'll start a new thread about this I guess.