[normloman]

Good design doesn't come from a hack. It's not a "one size fits all" solution. You need to think deeply about the problem you're solving, the audience, the author, and the content. I recommend reading a book on typography. Then you'll understand why line height matters, and why sometimes 1.5em is inappropriate (Though it's a good rule of thumb).

[eliot_sykes]

Is there one typography book you'd recommend in particular to start with?

[sevilo]

I've been reading this one lately, it's not so much practical typography, but rather the history and backstories of types. I find it quite a fun read, and it can inspire your interests and appreciation for types, if you don't already know much about typography.

http://www.amazon.com/Just-My-Type-About-Fonts/dp/1592407463

[OWaz]

Butterick's Practical Typography[1] is free online and a really good read.

To go beyond just one book there are good posts and book recommendations on Typekit Practice[2].

[1]:http://practicaltypography.com/

[2]:http://practice.typekit.com/

[eswat]

I’m not sure if there’s a better book out there for UI design in general, but The Elements of Typographic Style[1] was the typography bible.

[1] http://www.amazon.com/Elements-Typographic-Style-Robert-Brin...