My pocket PC. It's great. Apart from being able to keep a record of what I'm getting up to, it can send emails, show me my photos, surf the net, read my beloved .pdf files, nag, er, remind me not to procrastinate, help me check the meanings of words, let me look at (small versions) just about every document I'm using at the moment, keep information in one nice easy place, play music and show me films(but I don't bother with these functions, 'coz of my magic MP3 player and our big TV). It can also talk to my mobile phone (scintillating conversations they have too, I can assure you) and it makes a fine cup of tea (joke).
Stop reading, start speaking
Stop translating in your head and start speaking Italian for real with the only audio course that prompt you to speak.
Of all the gadgets I have or have had, it's one of the most useful and is used more than my phone, which is saying something. It is so dinky and portable that I can take just about anywhere.