I think it would be a great idea to have to look up tables for the Marketing channel Manager's Channel IDs, much the same way there are Mobile lookup files for Data Feeds.
These lookup tables would correlate to Data Feeds to help understand what Channel ID names were used instead of a numeric value. The lookup dates would be delivered with the data feed.
This would be particularly helpful for companies with multiple report suites (we have over 200!) - if we had a mapping table as a tsv like for the Mobile lookup, this would allow us to efficiently report on marketing channel when using the data feed!