There are already quite a few articles with software tips on the blog, so let me highlight them here for you. There are tips for Photoshop, Lightroom, Ptgui, Color efex pro and of course Oloneo Photoengine. Of course there are also tutorials available, but this are just the tips & tricks :)

Photoshop tips

Lightroom tips part 1 / part 2

Photoengine tips

PTgui tips

Color Efex Pro tips

Lightroom tips