1. The Diagrammed Summary of Lojban Grammar
2. Various Lojban Wordlists.
3. The jbovlaste dictionary interface, a way to browse and enter lojban word definitions.
4. Purchase The Complete Lojban Language by John Woldemar Cowan, which is the definitive word on all aspects of the language. (See the on-line HTML draft of this Lojban Reference Grammar).

There is a lojban-to-English translator at http://www.lojban.org/jboski/.