I'm currently working on this problem right now with my company imVOX (<a href="http://imvox.com/trial.php" rel="nofollow">http://imvox.com/trial.php</a>). We're trying to finish up our client and slowly pull out of the real 'testing' phase of beta and more into an RC status and have load tests, etc.<p>Yet getting good beta testers is hard. Many people sign up, use it once, hit a bug and then never return. Understandable, but even emailing people (personally) hasn't been all that effective in getting people back consistently. I probably have 10 people that I can keep going to and know that they will use it again and again and provide feedback.<p>I've yet to go on a strong blog push yet, but thats probably my next approach.<p>Other methods to find bloggers: YouTube and Twitter Search. I've also been looking through friend's shared stuff on Google Reader occasionally to mark off ones to contact.<p>One twist that I have as problematic is that I don't have and 'special codes' to hand out to people currently. We had a system setup like that a while ago, but I think it was slowing downloads a bit so now its just a download link and you register for a (free) account in-client.<p>In addition for ideas of how to get more testers via blogging (commenting is important I know too), anyone trying it out would be really appreciated. I'm going to have them push the newest build to our download and auto-update servers later today.