Normally I'm applying for contract posts and these extrenal interests are seen as positives, but in this case the large internet company expressed concern that all the other things I was involved in might indicate a lack of commitment to a full-time job. They still were still debating whether or not to invite me to a second interview when I accepted an alternative offer.

That sounds short-sighted on the part of that first company. Imagine not hiring these positions for these reasons:

• A movie director because they create independent movies.
• A graphical designer because they draw and paint in their spare time and show their art.
• An engineer because they build hobby robots, train sets, or radio kits and trade with others who share their interest.
• A chef because they enjoy gourmet cooking and run a tips and tricks web site or have a cooking show on cable access.
• A carpenter who does volunteer construction work for his community.

etc., etc.

I suppose the real distinction here is people enjoying these hobbies while at the same time maintaining a public presence of some sort regarding that hobby.

Anyway, the company you mention sounds short sighted. I'm glad you accepted that alternative offer.

Matt