I just took a look at the Guinness Book of World Records site, and they have a listing for the Largest Collection of Non-Sports Cards as follows:
Who: EDO RAJH, IVA RAJH
What: 20000 TOTAL NUMBER
Where: CROATIA (ZAGREB,THE RECORD HOLDERS' RESIDENCE)
When: 18 NOVEMBER 2011
The largest collection of non-sports trading cards belongs to Edo Rajh and Iva Rajh (both Croatia), consisting of 20,000 cards as of 18 November 2011 and is housed in Zagreb, Croatia. The collection started in 2006 with Magic: the gathering cards and their favourite trading cards are from the World Wildlife Fund.
This makes no sense to me, Todd beats that record regularly with just his newest pickups postings. Todd, or Marty, or Ken, or Greg, or someone else here, you have to apply for this record, there is a button on the website to apply to beat the record.