While the prospect of ads in your inbox kinda sucks, at least these ads are going straight into the "promotions" folder.
The company has shown ads alongside Gmail messages for years, but these ads appear as messages that can be opened like e-mails and forwarded to others, according to Gmail users who started seeing them last week. They appear only in the new "promotions" tab of Gmail's new multi-tab interface, and they're marked with a pale yellow background and labeled "ad," similar to how Google treats some search ads that appear above or to the right of search results.