Once it was caught up, I went ahead and set up replication the other direction as well. We now have 2 servers which can handle any queries and the other will get the same data as well. All I can say is that it's about time. We've needed this for a while now.
This coming week, I'll be moving another switch over and putting the db servers behind the load balancers finally. That'll allow for a fail-safe, not to mention allowing me to reboot the database servers individually without shutting things down or having a short outage. This should also help me get some peaceful sleep since I finally won't have to worry about what happens if a server goes down.
Overall, I think our infrastructure is heading in the right direction to handle a lot more traffic, and it seems that each improvement on the server side seems to increase the output on the sales side. It also gives me options if I want to set up something unconventional, such as the W3C HTML validator that I have running on one machine now. But the biggest thing is that there is very little that happens on a typical day now that affects the performance for our users. That's what our investment has been about.