This is a great resource to use in conjunction with The Chicago Homer (and I'm hoping they do eventually share a common interface). Here is a quick example of two specific ways it has helped me.
(1) In my thesis research I'm currently spending a lot of time on the verbal exchanges between Hector and Achilles in Iliad Book 22. I'd really like to know what some of the scholia say about a few of my passages (scholia, as you might recall from our earlier post, are the marginal notes in manuscripts which preserve useful commentary on Homer). So I go to Eumaios and click Iliad Citations in the menu bar. This brings up a list of books, and I scroll down to Book 22 and click on it. From there I click on one of my key lines: 22.262. This brings up the Greek (in transliteration) and English of this line and surrounding context. Then I click the Scholia link and it gives me the two entries on my passage from Erbse's edition. Now I can learn, among other things, that ancient readers recognized a connection between Achilles' use of the lion/human contrast and the Greek fable tradition, something which will be helpful in my argument and which comes up in one of my key secondary sources (Jonathan Ready,Character, Narrator, and Simile in the Iliad, 64ff). I initially did this research before I was using Eumaios, which meant a trip to the library, pulling Erbse off the shelf, and photocopying the relevant page. Eumaios would have saved me lots of time, even compared to using TLG.
(2) Two lines before that text, in Il. 22.260 there is an interesting expression about Achilles "looking darkly" at Hector. I've seen this expression elsewhere, and want to find out a bit more. Of course The Chicago Homer can help me find other examples of this phrase, but Eumaios will help me find bibliographic information. I click on the left menu Repetitions by Location, and navigate to my line: 22.260. From there I click on bibliographic reference(s) and it brings up this:
Spend some time playing around with the site and use it in conjunction with The Chicago Homer. If you are working your way through Eleanor Dickey's book, perhaps you might try using the scholia on here to practice your newfound skills in scholarly Greek?