I would also love to see a file with this information to complement the GTF file. Do you have the attribute files after the Cuffmerge call, which would contain a mapping of transcript_id or gene_id back to Gencode ID?
Thanks for the great resource!
All my best,
Dan
Dan E. Webster
Damon Runyon Postdoctoral Fellow
Laboratory of Louis Staudt
NCI/NIH