Links

This is the official site for Velikovsky, it is one of the most organized sites I've ever seen regardless of subject matter.
http://www.varchive.org/

These are Pro-Velikovsky Pages
http://www.ebicom.net/~rsf1/vel/vel-pro.htm
 
 

these are excerpts from Worlds in Collision showing the amount of historical research he did
http://www3.bc.sympatico.ca/JNHDA/wic.htm

here are two short biographies on Velikovsky
http://www.flash.net/~cjransom/vel.html
http://www.bearfabrique.org/Velikovsky/biovel.html

this has links to Catastrophisim pages (A bit out there theory-wise)
http://www.knowledge.co.uk/velikovsky/ages.htm

The debate rages on, these are journals in support of Velikovsky type views.
(I haven't read them so they probably are bizarre)
http://www.catastrophism.com/cdrom/pubs/journals/pensee/

On a search engine type Velikovsky and you will find plenty refuting his ideas, but here are a few.
An Antidote to Velikovskian Delusions
Crank Dot Net

background picture taken from http://antwrp.gsfc.nasa.gov/apod/ap990131.html