For Latin Grammar and Vocabulary:

Allen and Greenough, New Latin Grammar
Latin Grammar Paradigms
by Eric Conrad of Ohio State University

Guide to On-Line Resources, including English/Latin Dictionaries
at the College of St. Benedict/St. John's University

For Petronius and the Satyricon:

Full Latin text of the Satyricon
provided by the Latin Library
The Petronian Society Ancient Novel Page
which includes a lengthy bibliography of secondary materials

For Macalester Resources in the Field of Classics:

Guide to Research in the Classics
provided by the DeWitt Wallace Library