hi jakarta struts 1.1 (WROX publication) is 1 of the good book for struts. THey have covered major chapters that are required to be known at the Novice level. In addation to this u can find lots of PDF and e-books on struts
It appears that most publishers of Struts books have not deemed the differences between Struts 1.1 and 1.2 significant enough to publish a new edition of their books. Indeed, there aren't that many significant differences. The one you mentioned is the big one. Another is the addition of "validwhen" to the validation framework. The only other significant one that I can think of is the use of wildcards in Action mappings. (Seethis link, section 4.10)
If you just get a good book on Struts 1.1 and make note of these few changes, you'll do just fine.
To see the release notes for previous 1.2.x releases, click the "This section contains release notes for changes that have taken place since Version 1.2.X" link. The release notes for 1.2.4 looks to contain most of the changes from 1.1, but 1.2.7 also seems to have a handful of enhancements as well.
- Brent (who still works with 1.1) [ April 24, 2006: Message edited by: Brent Sterling ]