A very nice way to centralize your sites and expose your content:
from wiki to blogs to RSS feeds aggregation to workflow and much more!!!
See the list of available elements to further customize your portal and integrate your solutions.
Check it out for yourself or wait for next entry for the URL of the public version of my LifeRay portal ;)
Links:
[1] http://pulse.veltsos.com/category/it/software/development