Dude. It's better if you sow seeds every 1 or 2 weeks. The problem growing cilantro is they can bolt (flower) very easily under stress and hot weather. Once they flower, the plant will slowly die until the seeds mature (just like an Auto strain). Planting a few seeds at different intervals can ensure you get to harvest the leaves for a longer period. Just something to consider next time actually you can still do this.
When the it goes into flowering mode, they will grow finer, smaller leaves and develop a very strong taste (which may be too strong for some people).
Nice tip, asurah. Having too many definitely won't be a problem for me. The girl and I love our guacamole, and not to mention, we have a bunny who can eat cilantro on a daily basis. Also, I've heard cilantro (or coriander, rather - as coriander is the seed, and cilantro is the plant itself) has low germination rates, so I figured I would try to turn out a bunch of seeds.
Also, if I end up with a bunch of flowering cilantro plants, I'll just harvest the seeds and use them next season. I bought 200 seeds for $2, so I figure if I get some seeds back, that's free money!