Spanish Whiz is an excellent Spanish vocabulary building program with sound for practicing listening and pronunciation, over 35,000 ready-made questions, and lets you create your own word lists. Extra sound files are available.
StartSpanish is for beginners as well as for those who want to review their Spanish and quickly get back on track. It contains brief yet comprehensive explanations about all of the most important parts of Spanish grammar, combined with exercises.
Travel Spanish is a talking phrase book that will help you both to understand and to be understood when traveling in Spanish speaking countries. You don't need to know any Spanish to use the program. Just listen the words and phrases provided.