http://shakespeare.mit.edu/julius_caesar/index.html
A website which lists the entire play of dialogue. A good source for quick reference of the text.

http://www.cummingsstudyguides.net/xJuliusCae.html#Speech
Entitled a "Study Guide," breaks down the text, characters, settings, themes, etc.

http://members.tripod.com/~lklivingston/caesar/act1.html
A concise, quick summary of the whole Act I of the play Julius Caesar

http://www.shakespeare-online.com/quotes/juliusquotes.html
A list of memorable quotations from Julius Caesar

http://www.sparknotes.com/shakespeare/juliuscaesar
A breakdown of each scene in the play, providing summary and analysis



Sources:
1) http://shakespeare.mit.edu/julius_caesar/index.html
2) http://www.cummingsstudyguides.net/xJuliusCae.html
3) http://members.tripod.com/~lklivingston/caesar/act1.html
4) http://www.shakespeare-online.com/quotes/juliusquotes.html
5) http://www.sparknotes.com/shakespeare/juliuscaesar