Adobe has released Acrobat eBook Reader 2.1 for the Mac, following months of public testing of two earlier beta versions.

Available for download from Adobe's site, it allows Macintosh users to access and read eBooks, including the 200 business-related titles announced last week. Some eBooks are available in portable document format (PDF).

Features in version 2.1 include 90-degree display rotation, and a post-zoom pan and scroll function. The application will also print and copy ebooks if authorized. Drag-&-drop and text-to-speech are also supported. It boasts a built-in dictionary for some titles.

Another feature, CoolType is described as an "adaptive" font technology that makes eBooks easier to read.

System requirements include a PowerPC Mac; Mac OS 9.0 or 9.1; QuickTime 4 or higher; Internet Explorer 4.5, AOL 5.0, or Netscape Communicator 4.7.5 or later.