I think of two things:
-the powerbook that does not ‘see’ the workgroup has SMB browsing turned off (with Directory Access utility)
-the computers are not synced with the list of workgroups (may take a few reboots, or a few hours)
On a small network, where all computers have the same workgroup name (default is WORKGROUP) the finder will not split up the file servers in the Network browsing, and show a list of computer names.
If there is one computer that has different name for its workgroup (or with appletalk zone) all computers should suddenly split up all file servers into My network, WORKGROUP (and any other workgroup name/appletalk zone), but that may take a while as noted above.
You can change the workgroup name of the mac in Directory Access (SMB options)
read this kbase for more information:[url] http://docs.info.apple.com/article.html?artnum=107804%5B/url%5D
maurits
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