Ning & 24HL
I’ve yet to play with Ning, although I’ve read about it and am impressed. Adam Rifkin told me about 24HL when I was visiting Ca last month, as they needed a front end developer.
I must say I was impressed when I read more about 24HL. Sounds like they are building a great place to work as well as great software.
See also Jot vs. Ning
