* Chicago Manual of Style: A comma is usually used after i.e. and e.g.
* Blue Book of Grammar and Punctuation: Commas are preferable/optional after the abbreviations.
* The Columbia Guide to Standard American English: [Editors] require a comma after the second period [in these abbreviations].
* The Guide to Grammar and Writing: The comma [following i.e. and e.g.] makes good sense.
* Lynch Guide to Grammar: Both abbreviations should be followed by a comma.
* Fowler's Modern English Usage: Commas do not usually follow i.e. (No comment on e.g.)

[[Source](http://grammar.quickanddirtytips.com/ie-eg-oh-my.aspx)]