What are some good gluten-free food alternatives?
I'm a coeliac from Australia and so my tips come from my experience here, but they should hopefully be useful regardless.

The first thing I suggest is joining your local society which can be invaluable in terms of support, information and even training. The training covers for example how to read ingredient lists to determine whether something is gluten free by ingredient.

As a general rule you need to avoid products containing [wheat, barley, rye, malts and triticale][1]. There are a few exceptions such as glucose syrup, caramel colour and dextrose derived from wheat where the ingredients are so highly processed that they contain no detectable [gluten][2].

Cross contamination and hidden sources of gluten can make it hard to ensure a gluten free diet. In my experience the hardest replacements are the bread based ones. They generally do not come close to the texture and taste of traditional breads. Baking your own bread may be the best option using gluten free bread mixes.

Eating out can become a bit of chore because many restaurants use gluten containing products such as sauces and fillers. I recommend contacting the restaurant beforehand.

The following products are some of the better gluten free alternatives I've found (couldn't post links because I don't have enough rep):


Zehnder Bread
San Remo Pasta
BuonTempo Pasta
Schar Products
Neumarkter Lammsbräu beer


References:


[1] http://en.wikipedia.org/wiki/Gluten-free_diet
[2] http://glutenfreefamily.com.au/2010/07/glucose-syrup-gluten-free/