5ks: Just don't. This is a personal preference as I really don't enjoy running until about 3miles in. If I were to sign up for a 5k, I'd probably suffer all but the last .2 and that's just not worth the t-shirt.
10ks: Great for a mid-week run. I wish they did more mid-week evening races. Especially during the summer time. Most weeknights I run at least a 10k and it feels like the perfect distance for a good workout without over doing it.
On a side note, just in case I ever wondered, I took some silly quiz in RunnersWorld recently and it said I was a distance runner. I prefer the challenge of a marathon which feels like it's a distance you're body really shouldn't do, but you push it anyway. Halfs are okay, but I suppose I feel with a good pasta dinner a half should be achievable pretty much any day of the week -- although especially cool for a weekend run. So 5ks and 10ks are clearly not my thing. Sorry for the sucky TIART.
