The speeches of the Attic orators are all available at the Perseus Project website.
The site is arranged alphabetically by author. Each speech is available in English and transliterated Greek. The site parses each Greek word and offers a few brief notes. Many other classical Greek texts, as well as images of ancient objects and archaeological sites, are also available. Of specific interest might be the dramas of Aeschylus, Sophocles, and Euripides and the works of Aristotle — specifically his ‘Athenian Constitution,’ a fourth-century guide to Athenian law.
The University of Texas Press is in the process of publishing a complete series of the Attic orations, The Oratory of Classical Greece. Several volumes are already available.
The Loeb Classical Library includes facing page translations of many Greek texts, including the Attic orations. The speeches of Antiphon, Andocides, Lycurgus, Dinarchus, Demades, and Hyperides can be found in the volumes entitled Minor Attic Orators vols. 1 & 2; individual volume(s) are devoted to each of the remaining orators.
A representative selection of speeches has recently been published in a single volume: Christopher Carey, Trials from Classical Athens (Routledge 1997).
Nomoi. A bibliography of ancient Greek law.
Gnomon Online. A searchable bibliography for classical materials.
Sites of interest
Demos Project: a digital encyclopedia of classical Athenian democracy
The Athenian Agora Excavations. The American School for Classical Studies’ comprehensive overview of the center of Athenian legal life, the agora.
Interactive Ancient Mediterranean. An online atlas of the ancient Mediterranean.
American Philological Association. The primary learned society for Classical Studies in North America.
The Greeks. Educational resources posted in connection with the BBC series.
The Greeks: Crucible of Civilization. Educational resources posted in connection with the PBS series.
Ius Civile. Resources and links related to Roman law.