The following are some good Italian language learning resources:

Dictionaries

• Collins Gem - best pocket dictionary.  Unlike Langenscheidt, includes the pronunciation (e.g. the stress) of the Italian words.  Also includes short but useful sections on verb conjugation and useful phrases.
• Langenscheidt - most convenient, since they are sold at the Support Site NEX Bookstore.  These yellow-bound dictionaries come in various sizes, and are generally of good quality.
• Wordreference.com - the best online dictionary; even includes a "Conjugator" for verbs.
• Oxford-Paravia Unabridged - best unabridged dictionary.  If you're really serious about learning Italian (including how to write properly, e.g. letters), this tells you more than you ever wanted to know.  Warning: "unabridged" is Italian for "heavy and expensive"!

Language Learning Books/Programs

• Accelerated Learning - (Luke's favorite program) Based on a somewhat new-agey theory of learning that involves playing classical music in the background, it is one of the most entertaining, easiest, and most effective programs. http://www.accelerated-learning.net/learning_langproducts.html, http://www.accelerated-learning.com/shop/ and http://www.101language.com/acceleratedlearning.html (and the nearly identical website http://www.multilingualbooks.com/acceleratedlearning.html) all have it for $199.
• Pimsleur - a very repetitive, route-memory learning program, but good for the car (since it is audio-only)
• Rosetta Stone - a computer-based program that shows you pictures and narrates entirely in Italian; on one hand, it is "immersive" (since it's only in Italian) but on the other hand, it's inefficient (since it doesn't capitalize on the fact that you already speak a language)

Web Pages

• http://www.slowtrav.com/italy/language/ Slow Travel's page has one-page guides to stuff like making a dinner reservation, as well as links to other resources
• http://www.ilovelanguages.com/Italian/
• http://www.vitanova.dds.nl/italian/learn-italian.html Focuses on Grammar, but great for "small" words; link to download the whole thing.
• http://en.wikipedia.org/wiki/Italian_grammar Wikipedia page on grammar (thorough and concise)
• http://www.geocities.com/f_pollett/i-ind.htm Teach Yourself Italian - fairly comprehensive (although old-fashioned) website

Podcasts

Thanks do the proliferation of podcasts, it is now possible to download a number of free (or almost-free) audio Italian lessons

• ItalianPod101.com is by far the most entertaining, with Marco and Cinzia flirting awkwardly throughout each lesson.  Many of their lessons give lots of good information, but they often go a bit fast and thus require repetition.