Gadgets
Recent to the EE scene, silenz is pumping out good advice on the forums and some sweet plugins/extensions/etc. on this website. There's Ajaxy goodness to be found- that link tracker is sweet- and unobtrusive.
VayaDesign
Oh! Handy plugins (I'm using the pagination one elsewhere) from this web development company. The link goes to the blog, but the whole site is worth browsing.