Genealogical Links

General:

Access over 400,000,000 records through familysearch.org, the new LDS genealogical website.
Submit your family tree info (deceased only) to ancestry.com (10,000,000 name tree.)
Check out Cyndi's list of over 40,000 genealogy-related links on the web.
National Genealogical Society homepage.
Gendex.com features an online family tree, disk space for genealogical files, and a GEDCOM to HTML translator.
Search the 375,000,000 name Family Tree Maker database.

Krey-specific:

Here are the Krey listings on ancestry.com's world tree (currently 12 listings.)
The Social Security Death Index lists 261 Kreys.
Download a zipped GEDCOM or PAF file of the Michael Krey line here (GEDCOM for use with multiple genealogical programs, PAF for use with Personal Ancestral File 3.0.)
If you do not have WinZIP or similar unzipping capability, click here and request full files via e-mail.
LDS Family History Resources including PAF 3.0 and Ancestral Quest 3.0 are available from Deseret Book online.
A search of the Family Tree Maker database returns hundreds of Kreys from as far back as the year 1600.
Many Krey documents are in German. Here's an online German/English translator.
Search for related lines at the RootsWeb Polish Genealogy Center.

Hint - Also try searching for other spellings of Krey:

Craie, Cray, Craye, Crae, Crey, McCray, McCree, Crea, Creigh, McCrea, Kraehe, De Kraaij, Kreh, Van Kraay, Kray, Van Kreij