The Maryland Native Plant Society website (www.mdflora.org) and the Virginia native Plant Society (http://www.vnps.org/)(many societies also linked to from the MNPS website) have a wealth of information including many publications.

To sign up for the discussion listserve: NativePlantsEast@yahoogroups.com - You can join this list via the web by linking to <http://groups.yahoo.com/group/NativePlantseast>. You can also post messages and unsubscribe from the list at this same web location. Once you are a member messages can also be posted directly to the list by e-mailing them to: NativePlantseast@yahoogroups.com.
NOTE: ***If you are afraid of too many emails request the digest version so you get no more than one email a day. ***

In addition to the MNPS and VNPS sites, one of the best sources for tons of information is the Montgomery County DEP web site: www.askdep.com (that's easy to remember! the underlying link is actually www.montgomerycountymd.gov/deptmpl.asp?url=/content/dep/index.asp, but www.askdep.com will get you there).

Other Sources: www.nwf.org/backyardwildlifehabitat/ Backyard Wildlife Habitat Certification with other information: for example see: www.nwf.org/backyardwildlifehabitat/birdsandberries.cfm, 'Tis The Season For Birds And Berries;

www.nwf.org/backyardwildlifehabitat/restoncertification.cfm, NWF Certifies Reston As Community Wildlife Habitat

DEP's Natural Landscaping web page: http://www.montgomerycountymd.gov/mcgtmpl.asp?url=/content/dep/Landscape/natural.asp

EPA's Green Landscaping web page (Mid Atlantic Region) http://www.epa.gov/reg3esd1/garden/