Dezignus.com  is a design centered blog that provides links to free icons, brushes and shapes, tutorials, vector graphics, patterns and the like.

Bittbox has released some free vector tree Silhouettes

Brusheezy has pointed to a set of  Branches and Foliage Photoshop brushes

Paul Lasaine has produced a Photoshop Brush Tutorial

Ladyoak.com is a Photoshop resources website, which offer a large collection of free photoshop styles, shapes and gradient presets

Blend Photos With Apply Image is a tutorial that explains how to use the Apply image feature in Photoshop
” Apply Image allows us to blend, or “apply”, a layer and channel from one image with a layer and channel of another image. It’s similar to using layer blend modes to blend layers together in the Layers palette, with the added ability to blend individual channels together as well. This not only gives us much more control over how the images are blended, but also opens up far more creative possibilities and gives us better overall results.”

Russell Proulx has a tutorial on how to create a customized Photoshop Web Photo Gallery using HTML Styles