Some of you may be wondering how to get your Star Trek fix right now, well luckily the internets are a wonderful place to get information. Here is a quick rundown of some places you can catch one of the shows.
Memory Alpha has a full list of current airings of all the Star Trek shows on the front page of their website. For those of you that don't know Memory Alpha is the largest online Star Trek wiki. You can find all sorts of cool trek info here.
For those of us in the United States, the Syfy channel and BBC America are the only stations listed as airing Star Trek the Next Generation. If you were planning on doing any watching for the 25th Anniversary, your best bet is probably dvd or online viewing.
If you don't have the money to go out and buy all the shows on dvd, and you want to watch something other than the Original Series you need to sign up for Netflix.
Netflix offers all six Star Trek television series for instant streaming. Amazon.com also has them.