I mentioned ScanDrop before. It’s a simple app that allows you to scan your documents directly in to Evernote (or Google Docs or OfficeDrop). Very useful indeed!
Basically terminal on steroids, more configurable, split panes, always-available via hotkey (like Visor), etc.
iTerm2 is a replacement for Terminal and the successor to iTerm. It works on Macs with Leopard or Snow Leopard. Its focus is on performance, internationalization, and supporting innovative features that make your life better.
Persona (personamail.info) is an email client that was designed to change the perception and experience of sending and receiving emails by focusing on People, the Conversations between them and the Knowledge shared in emails today. This is a reaction to the paradigm of emails presented in spread-sheets seen with most email clients, where a focus on presenting data prevails over the need for a personal touch.
Nice take on email
(Source: vimeo.com)
Found this little tool this weekend and really like it! It helps you with arranging your windows on screen, quick and easy to keep thing tidy. Like use the left half of your screen for a browser and the right for an editor. I especially like the grid selection tool. You can buy it from http://manytricks.com/moom/ for $5 in the app store.

Useful little tool if you’re working with less.
{Less} extends CSS with variables, nested rules, operators and more. If you’re still building websites without it, you’re an idiot. This app makes it dead simple to use {Less} by automatically compiling *.less files into standard CSS.
(Source: twitter.github.com)