My friend Greg and I just had a fascinating and extensive discussion about the concept of airlines charging their customers by the weight of their bodies + luggage. 

The way we envisioned it, all airlines tickets would be composed of exactly two fees: a seat fee (fixed) and a weight fee (variable).  This is hardly our original idea; I’ve seen similar suggestions pondered on the web before.  But nonetheless, I thought it’d be interesting to reflect upon some implementation ideas as well as pros and cons.

Have you heard about TipJoy and the still-very-small phenomena of tipping (real money) on the web?

It’s quite fascinating, in my opinion, and I certainly have very mixed feelings on this issue.

PLUSES:

• I admire how the founder gets “out there” to talk about his service... but not only about his service. 
• I think there’s a true need to reward outstanding authors/contributors on the web with real money, and I think tipping is better than huge ad clutter / massively off-topic ads.
• In particular, I love the idea of tipping in the context of supporting artists and art online.  Give me great MP3s, and then give me a culture in which MANY of us offer tips… even $2-7/album, which’d be WAY more than the artist would normally get via CDs or iTunes, etc.
• TipJoy is pretty easy to use.
• The fees seem reasonable.