Agregate function, like sum(), to concatenate strings in group by

Oracle8i Enterprise Edition Release

Let's say i have this data:

Name Hobbies
Joe Read
Joe Sports
Bob Videogames
Bob Sports
Bob Cook

I want a query to generate this output:
Name    Hobbies
Joe      Read, Sports
Bob     Videogames, Sports, Cook

This is pretty much an aggregate function that concatinates text across rows (like sum() adds numbers across rows). Is there such a function? Can I create such a function? Is there another way to do this? My ASPs run the query, but I don't want to have the ASP go through the data and do the grouping. It would be nice if the SQL just returns the data in a state ready to be displayed.
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of course you can do this in SQL query.
I will direct you to a link (credit to Tom),F4950_P8_CRITERIA:802901216021,
Broken links for asktom - please copy-paste the solution here.

I see why you didn't paste it, here's the new link to the same solution:
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