I've started my guild, and have been recruiting. I did manage to recruit a few people, and so the Winter Court is up to about 5 60s. I've gone on UBRS with a couple of them, and am actually very happy with the quality of members. If we can get 35 more like them, we will do extremely well.
On the down side, I think I've made a couple of mistakes already. First, I changed raid dates. There's a very interesting discussion in the comments of the previous post, and I agree with the side that says you should have fixed, predictive raid dates. Yet I switched my raid dates from Mon/Wed/Thurs/Sun to Mon/Fri/Sat/Sun. Basically, real life interfered. My work hours will be unpredictable for the next little while, so focusing around the weekend will allow me to be present more often. As well, it is fairly early in the guild lifespan, so it shouldn't have much of an impact.
The second mistake was recruiting a few non-60s. I've been thinking about this a lot, and while the non-60s are good players, they are playing a different game than the rest of us. There are two games in WoW, levels 1-59, and level 60. I think a guild needs to focus on the game it is playing, and have players that share in that goal. Rather than recruiting 50s early, it may be better in the long run to wait until they hit 60 and realize that they are playing the second game.
Of course, I'm going to keep my current non-60s. It would be terribly unfair to boot them. However, I think I'm going to make being level 60 a requirement of joining from now on.