I try a ton of new software as it comes out, either for reviews in articles I write or because something looks really good. Topaz Adjust 5 is better than just good, it is fantastic! This plugin offers a variety of actions and effects, but what I really like is the effect it has on my landscape shots.
Here is an example. This image was taken last week in Yellowstone. We had a lot of overcast skies, so there wasn’t much contrast and pop to the images. I ran the ‘heavy grunge’ HDR effect on this shot, and one click I had a much nicer image (the image at top). This program is inexpensive, and a great way to spice up your image with one click. I also use Alien Skin Exposure 3 to add effects. My favorite is their Velvia action.