Capital Community College Foundation
Guide to Grammar and Writing: Abbreviations
A very competent look at how to use abbreviations in their proper context. This site also examines the proper use of abbreviations with titles, numbers and phrases.
Quia
Quia: Grammar Mingling at a Party Activity
This website presents a series of conversations where each sentence has a grammar usage drop down menu. You pick the correct word for that sentence. If you are incorrect you are given a second chance to correct your mistake!