As for the technical problems everyone has been having with the site, I'm gonna have to propose that we drop soundcloud embeds entirely on these and just use the onsite embeds and dropbox from now on. In my experience last night, even with only like 30-40 entries on page, my computer still lagged a huge amount, this has been bothering me to the point that I went ahead and ordered some more RAM. Having more RAM may or may not fix my issues with the site, but i still have a couple friends that say that the site takes over 5 minutes to load for them and I'd like for them to be able to enjoy it as well. Also with soundcloud, we get the issues of the HTML5 embeds causing crashes on some peoples browsers, i think this has been limiting the number of people that are able to attend synchlistens and should be addressed soon.
Now, dropbox isn't perfect, it has it's issues that allow people to submit future entries, however i don't think this is anywhere near as big of an issue as the lag that soundcloud embeds cause. Perhaps we'll just have to trust people to respect the system with the dropbox embeds.
Also, one other possible site to look into for embeds could be this one over here.
http://eqbeats.org/