>After an INSERT/UPDATE (in a trigger), I need to take all fields in INSERTED cursor and concatenate them in one variable to place the result into a text field name DETAIL in a table named JOURNAL. How to do that?
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>P.S.: The difficulty here is that I need all the columns but I don't know their names (it will ne a general stored proc - it can be called from any updated table). Then I must to use sysobjects and syscolums tables.

http://www.nigelrivett.net/SQLTriggers/AuditTrailTrigger.html should get you started. Keep in mind that DELETED and INSERTED table could have more than one record because trigger fires once per SQL statement not once per row.