Here are a few useful resource sites for documenting research papers and online resources.
MLA Web site
The site contains information and advice concerning documentation of online sources.
Beyond the MLA Handbook: Documenting Sources on the Internet
"Beyond the MLA Handbook: Documenting Sources on the Internet" has been compiled by Andrew Harnack and Gene Kleppinger of Eastern Kentucky University (Richmond, KY). You'll need to download 51K in order to get this data, but it is an invaluable source for this information.
"MLA-Style Citations of Electronic Sources"
Those who have less powerful computers or who want a condensed version may prefer the "MLA-Style Citations of Electronic Sources" by Janice Walker of the University of Southern Florida at Tampa.