they are listed in filters menu
Nowhere, Photoshop is not free software.
Photoshop CS4 Bible Check Here http://www.amazon.com/Photoshop-CS4-Bible-Stacy-Cates/dp/0470345179
probably you want extract,yes you can download from adobe site
if you have downloaded brushes from internet,first copy and then go to C:\Program Files\Adobe\Adobe Photoshop CS4\Presets\Brushes and paste it,when you start next time Photoshop it will load that set of brushes automaticaly
Filter -> Blur
You can go to www.adobe.com/downloads and get a trial version of Adobe Photoshop CS4 for free.
CS4 Extended is the legal version that you must buy. CS4 Portable is a free, illegal version that does all the same things as CS4 Extended, the only difference is that you can't add plug-ins
cs5 is better
The average price of Adobe Photoshop CS4 is $1299. The software package is available from several online retailers for this same price with varying shipping costs offered.
The extended versions have all of the features the normal ones do but they offer extra features such as the ability to import and edit 3D graphics, video enhancement and more tools to use for editing images etc.
you probably mean plug-ins?As you install any software,if you mean actions then copy and paste in C:\Program Files\Adobe\Adobe Photoshop CS4\Presets\Actions
Adobe CS4 is the latest software offering by Adobe who makes the Photoshop software. CS5 is rumored to be released in a few months.