One of the most important features of Safari 5 is support for extensions: it’s what Safari users had been wanting for a very long time, and it’s a big deal. It’s a big deal for users who want to customize their browser the way they want, it’s a huge deal for developers who may start to charge for full-featured extensions in the future. Just think about Twitter clients or RSS apps living inside the browser.
Safari 5 has been available for 12 hours now, and some developers have already released their first extensions. Obviously these extensions are far from being “complete” and “full-featured”, but still it’s worth taking a look at them, as they’re giving us a glimpse at what devs might offer in a few weeks.