I find that post processing helps my shooting, especially the framing. Unfortunately, while shooting and checking the images, I am usually satisfied. After loading the images and taking a look at them on a larger screen, I start to find things that I should have done, framed things poorly or see better ways to have framed/composed the images.
A while ago, I finally broke down and bought LightRoom. I really do not like their catalog, but I have come to understand their image adjustments. The reason I finally bought LR was that there were so many videos on YouTube as free tutorials - I figured that in and of itself would help me. I happened across one of the sets that offered a processing workflow that made sense to me. Having a process helps a lot, and in turn has really added an extra dimension to the images in general. When I have a problem that I need to correct, I just do a google video search on the subject, find a couple of videos that show what to do, and follow along with my image. It may not be perfect, but it gets me close enough.
I have put together a set of utilities that appeal to me, for what ever reason. LR, Microsoft ICE for stitching panoramas, Oloneo for bracketing and HDR.
Several years ago, I picked up a little netbook with the idea of using it to tether with the camera - with a 10" screen, I could see the images better. Pentax still does not have their tethering really useful, but I take it with me when traveling to review the images and possibly make adjustments in the evening for the next time I shoot.