Hmmm, I hadn't heard about core i3's before. They're only dual-core, right? I didn't expect any more dual-core processors would be released. I think I'll assumed these are the last of them though.
i3 are dual cores without HT, 2 threads. i5 are processors with 4 threads, the i5 750 is a quadcore without HT, the remaining ones are dualcores with HT. The naming is confusing.