I don't have much experience with split testing but I think testing them at the same time will not affect the results as long as you keep it as organized as possible. It's actually getting and keeping the testing organized that might be difficutlt Google Analytics has a split testing feature that you can try.
30 Nov 12 10:52 am
Google Anylitics gives chance to do this for free, so search their help, my expiriences with split A/B testings are something that lead my landing pages up to 50% conversion increasing, so it is WORT anycase GA give it for free.
26 Dec 12 10:59 pm
I am in the process of doing my first split test and from what I have been reading on Google is they will keep everything separate that is the whole reason behind the test is to see the results so you should get results that show both a and b as well as showing ad results.
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