Frank, since you mentioned you're searching for your dream home, I'll assume you're not an investor. In that case, the first part of my answer will echo a lot of what has already been stated. Unless you're looking in 2 geographically different locations, or using 2 realtors who specialize in different neighborhoods, you probably should stick with 1 realtor.
Yet, if you were an investor, then I'd state that there's nothing particularly wrong with using multiple agents--especially if they all have different specialties (specific neighborhoods, pre-foreclosures, REOs, etc). For example, you don't want a realtor who specializes in pre-foreclosures to represent you on REOs.