This simple Workflow just creates UUIDs (by calling uuidgen) and paste it at the current cursor position. Optionally UUID will only be copied to clipboard (CMD modifier).
Get the workflow from packal.org: http://www.packal.org/workflow/uuidgen
Sources on GitHub: https://github.com/eliasmaier/uuidgen.alfred
[edit]: add alfredworkflow file...
[edit]: submit Workflow to packal.org, the new place for Alfred workflows