Macworld magazine has announced its “Best of Show” awards for Macworld Conference & Expo, taking place this week in Boston. The awards are “given to products either making their public debut at Macworld Expo or recently introduced and generating excitement on the show floor.” The winners are: Native Instruments’ Guitar Rig, Parliant Corp.’s PhoneValet Message Center, Harman Multimedia’s JBL On Stage, @Last Software’s SketchUp 4.0, and Gee Three’s latest collection of Slick Transitions & Effects — Slick Vol. 7 and 8.