Links
Online Bookstores
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Useful Websites
Jisho.org is a comprehensive dictionary site with a very fast kanji search by radicals.
Tangorin.com is another good dictionary site that has searching for words with wildcards.
Rikaichan is a Firefox plugin that displays a dictionary dialogue on mouseover of Japanese text.
Rikaikun is the Chrome/Chromium port of Rikaichan.
JMDict/EDICT POS Markings - A quick-reference list of the POS markings for use with JMDict/EDICT-based dictionary programs such as Rikaichan.
Aedict is a Japanese dictionary for Android.