Expect comes with a bunch of examples that are indispensable and unique full-function tools in their own right like cryptdir, [passmass], unbuffer, [kibitz], [dislocate], etc, etc.

The latest cool new Expect whizbang: [multixterm].

[LV] offers an example of his use of Expect:  "Our local public library used to have a telnet interface to its patron account system.  I wrote an Expect script which logged onto the system, queried for the holdings status of each account in my family, then logged off.  I would run this from [cron] and get a report as to which books were coming up for return, what items were held for pick up, and so on.  I then placed the text version of that report into a directory where a daily sync to my Palm Pilot would result in a PalmOS memo containing this info."
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[Category Expect]