The easiest method would be to vacuum centrifuge (SpeedVac) the samples. However, you will also concentrate the solution/buffer they are in. If this is a problem, you may like to look at using a spin column.
Right, you can concentrate DNA using speedvac but as mentioned by Kevin, salts will also get concentrated. Most likely you are using column -based extraction kit hence this question. Another alternative (and perhaps better alternative) would be to ethanol precipitate your DNA. Following washing, you can have the DNA in minimal volume.
it depends on several factors. If you don't want to speedvac and if your sample is rather concentrated, you can precipitate your dna by ethanol or better by isopropanol. If your sample is dilute, you can add a sufficient amount of carrier such as glycogen before precipitation. Be careful not to loose your precipitate. At last you can extract the water by butanol but this will also concentrate the salts
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