Just as a general matter, I would suggest always checking the GenWeb site for whatever state/county you think could be relevant. There is a wide variation in the level of sophistication, but often you will find death and marriage index listings that you don't see elsewhere, and sometimes there will be bios and other helpful stuff as well.
Also, try the web sites for any county or regional genealogical societies - again, it varies a lot (just depends on the interest levels, especially if staffed by volunteers) but I have gotten some really great stuff that way. For instance, for a very nominal charge (something like $10) I got copies of newspaper notices of 1860s-1880s deaths, births and marriages for family members from Solano County, California.
In one case (my personal favorite) I got the record of a guilty plea entered by my great grandfather's brother for having unspecified "gambling devices" in his home in Oregon, around 1855 (through the Rogue Valley genealogical library, in Jackson County, Oregon)! That particular organization had a real treasure trove (if you have ancestors there, consider yourself lucky), including things like jury service lists, cattle brands, local newspaper articles indexed with names, marriage lists, birth announcements, and much more.