Yours is a totally different problem, but still most likely not what you think. Similar to the other post, Word simply calls for cooperation from the OS in order to save a file. In your case the OS is not responding properly & causing Word to wait as a result of hardware or software maladies. There are any number of possible causes, especially if there is a network involved, but you, too, need to start with the basics:-)
Reapply the 10.4.11 Combo update, repair permissions & run Disk Utility's Verify Disk routine - or better yet, Disk Warrior or TechTool Pro if you have them. I'd also recommend that you back up any important files - this behavior is sometimes indicative of a drive that's going up. Hopefully you can resolve it before that happens:-)
Regards |:>)
Bob Jones
MS MVP [Office:Mac]