Best ways for improving "tactics" I have been playing chess for a long time, and I have been around 1850-1900 ELO for quite some time. I have always wondered which are the best ways to improve the tactics. 


Does playing more and more games improve chess tactics?
Playing limited games but slow games?
Practicing board positions with sites such as chesstempo?
Analyzing others' and self games


Please feel free suggest any point that I have not covered.
All of the suggested can improve your tactics skills. Anything that makes you think hard about chess positions (particularly sharp and complex ones) will. I would add "perfecting the way you calculate variations", i.e. making sure that your calculation is as effective as possible. This was well described in some book, I think it was "Think like a grandmaster" by Kotov. Two points though:


Chess is not only tactics, the strategy, "feeling" for positions, is equally important. And one should always come with the other. In fact they make each other better.
Judging from your Elo, you are a hobby player. Getting better may need hard work which does not always agree with the word "hobby", so pick the method that you enjoy and keep in mind that everyone has limits.