The Owen and Goodspeed book is very handy, and small enough to be slipped in your pocket and carried around. But the Perseus (.org) website has a feature that allows you to form your own vocabulary lists, from any author or book or chapter, with great flexibility. You can fashion your own criteria, and decide how many words to list (ie. top 10%, 20%....100%). Perseus offers other tools too: commentaries, dictionaries, and grammars. But the core of the site is a library of Greek literature that can be electronically searched, and in which each word is hyperlinked to a definition, grammatical information, and endless textual statistics. Personally, I prefer reading and handling books, but Perseus is a great resource for identifying (or narrowing down) unusual forms. Sometimes, and especially with Homer, the hyperlinked information seems unable to positively identify a form, but it is often helpful and always free. I am also excited and grateful to have found this forum of interesting and motivated people!