Hi Verb
it's just sediment from conditioning - dead yeast n'stuff. If you have added sugar when bottling to carbonate your brew, the yeast will continue to work and therefore drop out causing a small amount of sediment.
You can't really avoid this unless you decide not to carbonate and even then you would have to ensure that the beer was perfectly clear when bottled.
Just pour carefully and throw about 1 to 2 cm away. If I have a good tasting beer, I don't really worry about a little cloudiness.