A new feature of AutoCAD 2008 is the ability to automate the sizing of annotation, such as text and dimensions, in viewports with varying scales.
The following objects can be annotative, meaning that they can size automatically:
- Text (single-line text)
- Mtext (multi-line text)
- Multileaders (which are new for AutoCAD 2008)
- Tolerances (in frames)
- Block attributes
Note that objects that use styles -- text, dimensions, and multileaders -- require an annotative style.
For more info, see http://www.ellenfinkelstein.com/AutoCAD_tips_automate_annotation_2008.html