[davidw]: It would be nice to see at least a simple example included for all Tcl man pages (or at the very least point to another page including an example).

Here is the current state of things:
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'''Files with examples:'''
 after.n     encoding.n   format.n  lappend.n  lrepeat.n   puts.n    subst.n
 array.n     exec.n       gets.n    lassign.n  lreplace.n  read.n    switch.n
 bgerror.n   fcopy.n      glob.n    lindex.n   lsearch.n   rename.n  time.n
 break.n     fileevent.n  http.n    linsert.n  lset.n      return.n  while.n
 catch.n     for.n        if.n      llength.n  lsort.n     set.n
 continue.n  foreach.n    incr.n    lrange.n   open.n      socket.n
'''Files without examples:''' 
 Tcl.n     eof.n         global.n   namespace.n   regsub.n   trace.n
 append.n  error.n       history.n  package.n     safe.n     unknown.n
 binary.n  eval.n        info.n     packagens.n   scan.n     unload.n
 case.n    exit.n        interp.n   pid.n         seek.n     unset.n
 cd.n      expr.n        join.n     pkgMkIndex.n  source.n   update.n
 clock.n   fblocked.n    library.n  proc.n        split.n    uplevel.n
 close.n   fconfigure.n  list.n     pwd.n         string.n   upvar.n
 concat.n  file.n        load.n     re_syntax.n   tcltest.n  variable.n
 dde.n     filename.n    memory.n   regexp.n      tclvars.n  vwait.n
 dict.n    flush.n       msgcat.n   registry.n    tell.n
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These are automatically generated (script below).  Some of these do have examples, such as msgcat and tcltest.  Others sort of do, but a functional bit of code that runs and demonstrates the command is always welcome.

'''Exception List''': The list of files that really do have (good) examples: binary.n msgcat.n tcltest.n.

and the list of files that describe commands that are too simple to really need examples (or that have them elsewhere): cd.n close.n

Adding an example doesn't take much time, and lots are already available on the wiki.  All you have to do is submit a patch to sourceforge.  The man page markup looks like this:

 .SH "EXAMPLES"

 A time server:

 .CS
 proc Server { channel clientaddr clientport } {
     puts "Connection from $clientaddr registered"
     puts $channel [clock format [clock seconds]]
     close $channel
 }

 socket -server Server 9900
 vwait forever
 .CE


I used this code to check:

 package require fileutil
 package require struct

 foreach res [fileutil::grep ".SH.*EXAMPLE" [glob *.n]] {
     lappend examplefiles [lindex [split $res :] 0]
 }
 set examplefiles [lsort $examplefiles]

 set allfiles [lsort [glob *.n]]
 set noexamplefiles [lsort [struct::set difference $allfiles $examplefiles]]

 puts "Files with examples: $examplefiles"
 puts ""
 puts "Files without examples: $noexamplefiles"
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[DKF]: Remember that some [Tk] docs need examples as well, though I'd tend to say not the widgets, as they're better demonstrated as part of the general [widget] demo.

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[AM] What about Wiki pages that show a particular package in action? I mention it here because it seems a nice starting place for it ... For instance:
- the http package is nicely illustrated with the page on the [wiki reaper]
- [A little Unicode editor] might serve as an illustration for dealing with Unicode 
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[Category Documentation]