I also recommend using Wikipedia and The Cambridge Encyclopedia of Language by David Crystal. However, some of the information in the encyclopedia on language families is outdated and should by checked on Wikipedia. Another highly recommended guide is the Wikibooks' book on conlanging.
Of course, even if you are totally uninterested in the Language Construction Kit, you may still be interested in other things on Zompist.com. He writes about his opinions on lots of non-linguistics topics, such as:
- Names of things in alchemy
- Politics in US
- How people from 1900 would think of 2000
- Science fiction
Among his linguistics stuff, there are many interesting things such as how spelling in English corresponds to actual sounds, writing English like Chinese, why there is no language instinct, why people learn languages, and whether all human languages sprang from one source or not.