There are many equally awesome pools.
BTCGuild which even though it charges a fee it pays miners transaction fees so in the end I make more there than at ghash.
Eligius has 0% fees and great statistical information.
NastyPool is a P2Pool with 0% fees and has the best implimentation of P2Pool I have tried to date.
There are many better options.
The problem is people are dazzled by a shiny web interface and supposed 0% fee. ghash does not pay miners TX fees so they make a ton off your mining. As Bitcoin continues to be more and more widely used those fees will grow and eventually outgrow the mining reward. If you think ghash will ever give you that you are mistaken.
24 h hashrate of GH is 43% again, so stop worrying.
Even if they have 51% for a short time, they would have to actively want to do something malicious in order to cause any harm.
I am wondering why nobody is building an equally awesome pool so there will be less problems in the future.