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One way is getting a typekit subscription and checking out their font lists [1]. Aside from providing many excellent fonts, there are good descriptions of mood properties and historical context that can really help to choose something appropriate.

1 - https://typekit.com/lists

Anyone have any other suggestions like these?

Source Sans Pro is Adobe's first open source typeface and was designed by Paul D Hunt. It was specifically designed for user interfaces, and is available in multiple weights. I think the regular weight also works well for body text.

https://store1.adobe.com/cfusion/store/html/index.cfm?event=...

The font is also available on Google fonts

Shameless plug: I use Source Sans Pro on my website if you want to see an example of what it looks like for body text and headlines :-)

http://www.interfacesketch.com/

Whenever I find a font on a page that looks interesting, I highlight it and go to Chrome's Inspect element Computed tab to get the font name. As the blog says, steal like an artist.