No matter what you're looking for, you can't go past the Oxford Text Archive . It is a very busy site, so you can also try here . Finally, if you really want the latest, best and most comprehensive stuff, you can't go past the Voice of The Shuttle . If you get lost, Sydney University student Matty Farrow has a searchable text site here . There is also a Shakespearean Poetry Search Engine available.
Subscription is by application to the editor .
Among other scholarly sources is the Elizabethan Review , which has a very good index . You could also take a peek at Reniassance Forum , or the august Shakespeare Quarterly . And when that gets too much, try Shakespeare Magazine . For an excellent who's who, try the Biographical Index to the Elizabethan Theater . In Elizabethan England , and another on Elizabethan Costuming .