Evernote 4 for Windows is a complete overhaul of the popular note app
You can now create a new clip from within IE, Outlook or Firefox without leaving your current app, and clipping emails in Outlook has been vastly improved. If you've had problems with Evernote losing your text styling when clipping from web pages and email messages in the past, those problems fixed in Evernote 4. Editing clips has also been improved with more text formatting options -- tables and bullets now work within clips.
If you're a Windows 7 user, Evernote has also added some features just for you. It works with Windows 7's Jump Lists, so you can pin it to your task bar and perform some Evernote actions without even having the app running. It also uses Windows 7's location features to automatically geotag notes, if that's something you find useful.
All in all, Evernote has done pretty well by the users of their most popular client (that's right, Evernote has more Windows users than Mac users at this point). If you've passed up previous Windows versions of Evernote due to lack of polish, Evernote 4 is a good reason to take a second look.