The following bugs has been fixed in 2.0b2: 
- The completion menu showed selectors instead of variables when completing at 
  the beginning of method, as the first word in a block, after a primitive call 
  or after a assignment.
- Under certain circumstances, a walkback could occur when accepting a the 
  text in a browser.
- Corrected the some code to get rid of Lint warnings and errors.

The new version is available on SqueakMap.

A documentation of eCompletion can be found here: http://homepage.mac.com/monique_bakker/squeak/eCompletion.html.

Have fun.
Ruben