A Big List of B2B Search Engines & Portals

I came across this list the other day and decided to abbreviate the list for my readers:
            www.Business.com
            www.jayde.com
            www.zibb.com
            www.globalspec.com
            www.thomasnet.com
            www.masterseek.com
            www.b2bcompass.com
            www.techtarget.com
            www.knowledgestorm.com
            www.it.com
            www.ithound.com
            www.alibaba.com
            www.made-in-china.com
            www.tootoo.com
            www.tradekey.com
            www.searchfinance.com
            www.construction.com
            www.scirus.com
            www.searchmedica.com