I'm a huge fan of Nik's software plug ins for Photoshop, Lightroom and Aperture. They are a great collection of tools that for me have become indispensable over the years. I was pretty worried about the future of the suite once they were acquired by google, and to be honest, I still am (especially after the Google Reader incident). For now at least, Google have done a great thing and dramatically cut the price of the suite. When I bought it it was around €400 for the whole suite, but Google are now selling it for $149. This is a steal for a great set of tools. It's worth it just for Silver efex Pro and Colour Efex Pro alone.

If you're still not convinced they offer a 15 day trial so you can try before you buy. I'm going to post a video soon showing some of my favourite features of the suite so stay tuned!