How fetch multiple rows into one text-field?

Hi,

how can I fetch multiple rows into one text-field?
I need the contents of some log-infos condensed into a single text to 
show in a report.

There is a log with a single record per event.
The log is like this   (log_id, case_id, log_date, log_category, log_notes)
I need a date-ordered list of log-date, -category, -notes   of all 
log-events of the same case-id like
log_date || ' ' || log_category || ' : ' || log_nots
e.g.
20.07.2009 Category 17 : utterly noteworthy notes
21.07.2009 Category 42 : lots more
22.07.2009 Category 17 : still more drivel

The report consists of a couple of case-infos and should look like
case_id, case_name, case_all_log_events

Is there a way to do this?

regards
andreas