http://www.dat.state.md.us/
Select ‘Real Property Data Search’
To determine who is the owner of a particular piece of Maryland real estate

http://www.taxpayerservicecenter.com/RP_Search.jsp?search_type=Assessment
To determine who is the owner of a particular piece of Washington, DC real estate

http://tax-acct-info.co.pg.md.us/servlets/resqportal?rqs_custom_dir=taxes&rqs_cleancache=0
Prince Georges: See if back taxes are owed

https://www.montgomerycountymd.gov/apps/tax/index.asp
Montgomery County, MD

http://www.fairfaxcounty.gov/living/taxes/
Fairfax County, VA - Slide to the bottom section entitled 'Real Estate' and input the address

http://inter1.loudoun.gov/webpdbs/
Loudoun County, VA

http://www.pwcgov.org/realestate
Prince William County, VA

http://www.alexcooper.com/index.htm#current
Foreclosure Announcements for Alex Cooper Auctioneers

http://www.tidewaterauctions.com
Foreclosure Announcements for Tide Water Auctioneers

http://realestate.yahoo.com/re/homevalues
Comparable home values

http://www.prestigedoesitall.com
MRIS Access

http://www.wsradio.com/realestate/
Real Estate Radio. Get tips and techniques to help you make more money investing in real estate.

http://www.housingzone.com/estimate/index.asp
Estimate the cost of repairs - average cost $17.00 - $21.00 per Sq. Ft. to remodel

http://www.housingzone.com/estimate/sidingvinyl.asp
around $4/sq.ft. VINYL Siding

http://www.firstsourceonl.com/housingzone/
DC Housing Building Code Ordinance

http://www.freepeoplesearch.com/people-search-engines.html
Enter the name of the person you are searching for a quick and easy people search.

http://www.crimetime.com/online.htm
Reverse address check.