dito, moshu.
I'd also like to add the following, wordpress "plays very well with others", in other words is much easier to intergrate with other products than some competing platforms. also, through plugins, etc, depending on your specific needs there are existing "bridge" modules for other "best of breed" solutions like coppermine photo gallery, osCommerce, xoops, and many others.
On in "standalone" mode wordpress is a lean, mean and powerful blog platform, when either used as a module or plugin (I suggest the 2.x.x versions only) with other products like xoops, etc. the possibilities for expansion/extension are limitless.