Today we are glad to release a yet another freebie: a Twitter GUI PSD for the recently released Twitter UI update, designed by Jon Darke of Every Interaction and released exclusively for Smashing Magazine and its readers. The PSD provides the full mockup with all layers in vectors, allowing you to scale up the design elements without loss of quality. The set includes two versions: one for personal accounts and also the new Twitter Enhanced profile page with 835×90 header image for brands and advertisers. The set is compatible with Adobe Photoshop CS4+.