"You must register to be able to upload your products to the Android Market. There is a one time $25 registration fee. We charge this fee to encourage higher quality products on the market (e.g. less spammy products)."

"For applications that you choose to sell in Android Market, the transaction fee is equivalent to 30% of the application price. For example, if you sell your application at a price of $10.00, the fee will be $3.00, and you will receive $7.00 in payment."

(http://www.google.com/support/androidmarket/bin/answer.py?answer=112622&topic=15866)

Google has recently promised that it won't follow Apple's model and it won't charge fees for uploading apps to Android Market.

"We made a strategic decision not to revenue share with the developers. We will basically pass through any revenue to the carrier or the developer."

(http://uk.reuters.com/article/idUKN1230844220080912?sp=true)

Applications sold in the Android Market are apparently not DRM-crippled and can be installed any number of times on any device:
http://www.google.com/support/androidmarket/bin/answer.py?answer=113410&topic=16286

This is great for usability, but the Android Market will need to offer a compelling customer experience if it is to prosper in the presence of unofficial distribution channels.