Forum ad slots are auctioned off weekly. Here is the current auction. Here are the ad stats. See the current auction thread for more info.

In addition to the inhouse forum ads, it is common for forum users to sell ad space in their signatures. These ads are not intermediated by bitcointalk.org in any way. If you are interested in advertising in this way, it is recommended that you hire a signature manager.

Main slots (1 in 10 chance)

Nine are auctioned off. One is the factoid slot.

Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
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Automate your trading like a pro. Lightning fast execution.
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Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
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Your favorite trading tools in one place. Lightning fast execution.
Start trading
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Factoid (see below)
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.

Factoid slots (1 in 550 chance)

Interesting facts, funny quotes, hints, info, and ads given away to supporters.