Seriously, greekbible.com is a wonderful resource with a built-in lexicon (I check it against Liddell & Scott though). I had two years of Classical and Homeric Greek in college, and I continue to read it for fun. Although I do read a lot of koine (New Testament-era) Greek now, I never studied it in school.
Besides, you know the "this rock" - "a rock" (or sometimes "a pebble") argument just comes up ALL the time . . . < g >
Cool!