A couple of sites have proved invaluable:-

www.japanesejapanese.com is its successor site. Currently a group blog, focusing on study techniques. Some of the content from kenkyuukai will be migrated across.

and

www.rosettastone.com - the online version of the RosettaStone language software. For me, not having a Japanese-language environment, this site enabled me to tune my ears into Japanese spoken at a natural pace. A subscription is quite pricey, but there is a free trial version you can take advantage of before deciding whether you need to subscribe.

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Study aids from www.jbox.com - everything from electronic dictionaries to elementary school posters.

The owner of jbox, Peter Payne, has an overview of Japanese in his personal blog site.

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Heaps of online resources at http://www.cs.ucl.ac.uk/staff/m.rowley/resources.html (with thanks to Karol)

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Learn Japanese podcast - starting from scratch, but a good listen.

More Japanese podcasts than you could shake a stick at:-

http://www.podcastjuice.jp/

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All you need to know about hiragana, katakana and kanji:-

www.kanjisite.com

With thanks to TelimFor of kenkyuukai.com, a fascinating article:-

Particles vs Patterns - Ken Butler's "Japanese CyberTutorial" 2

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The Japan Centre in Piccadilly is irresistible. And why not shabu-shabu at Mitsukoshi in Regent Street?