One of my pet hates is the use of abbreviations without using an explanation. There are some fairly common ones about, such as e.g. (for instance, for example). However, if you can get away without using the abbreviation, please do. I worked in the supplies division of the army for 6 years, and they are terrible for abbreviations and strange shortcuts. CSM e.g. means company sergeant major, the terror of all troops. I found guidelines for the use of abbreviations in the U.S..
Allied to that is textspeak, or should I type txtspk. When I first came to AOL, now 4 years ago, I didn't have a clue what somebody meant when they typed CUL8R. Of course, I now know it stands for "see you later". And I also appreciate that not every internet user is a 70 wpm fast typist like myself (coughs). Moreover, you can't type fast on a mobile phone keypad, and I see the need for shortcuts. However, textspeak is beginning to intrude into everyday language, and it's a degradation in my book. It's the answer to a lazy man's prayer.