Down the left hand side there are a number of filters, allowing you to filter the content, and a few of these I've never seen before. There are filters for/about Professionals, Male, Female, Kids, Teens, Seniors, African/Asian/Hispanic/Native heritage, basic/advanced reading, easy to scan, fast loading, for text browsers and interactive tools. There is also a search history for the last 10 searches that have been run.
But wait, there's more. Running a search for a specific drug pops up a little information box (think quick answers and you've got the concept) with more data. I tried 'aspirin' and was given information on what it might also be known as, data from MedlinePlus, an image link from Drug Digest, and a quick overview. Within the results I was given tabbed options for 'All', 'Dosage', 'Uses', and 'Side effects'. There's also a useful 'help' option as well - something far too many search engines are ignoring these days, and the option of choosing from 3 different font sizes.
Healia was created over a 4 year period under an award from the National Cancer Institute, and while this is obviously a good thing it does allow me to mention my only real criticism of the engine which is the strong US bias to it (as you might already have got from one or two of the filters) and this is a real shame. I'd like to see another set of filters for Geographic content for example, but perhaps I'm just being really greedy with it at this point.
All told, this is a really splendid search engine, with a great deal to recommend it and lots of fascinating functionality that makes it worth exploration if you're a health professional, and even more if you're not! Oh yes, and you can also add their search box onto your site as well, so give it a spin.