Updated the guidelines (added Bounties (Altcoins), removed the "post traditional investment like tokens in Marketplace (Altcoins)" clause):
Announcements (Altcoins) - Altcoin announcements, generic (usually announcement like) coin discussion threads.
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Marketplace (Altcoins) - On-forum sale of goods and services either altcoin related or sold for altcoins.
Bounties (Altcoins) (child board of Marketplace (Altcoins)) - "Altcoin bounties and ad campaigns". Bounties, advertisement campaigns, announcement of external giveaways (that do NOT require posting on Bitcointalk) and other similar threads belong here. Discussions about such campaigns / services do not belong here.
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Service Discussion (Altcoins) (child board of Marketplace (Altcoins)) - Discussion of altcoin services (both external and on-forum). This includes discussions about bounties.