As part of its sponsorship of the Carnival of the Mobilists, Khosla Ventures is awarding $250 to the author of the best post each month. Every week, the host picks their favorite submission, and at the end of the month, they’ll go up for public vote. Here are the nominations for November:

• Andreas Constantinou of Vision Mobile on operators as service pipes or bit pipes
• StayGoLinks on the crumbling operator walled gardens
• Brash.com on what forces might break the hold that carriers have on the mobile market

Here’s the poll. To vote, you’ll need to enter the password mobilists.