By JP Mangalindan
October 5, 2011

Fortune’s curated selection of newsworthy tech stories from the last 24 hours. Sign up to get the newsletter delivered to you every day.

* After months of intense speculation, Apple (AAPL) and CEO Tim Cook announced the comparably-priced iPhone 4S for AT&T (T), Verizon (VZ) and Sprint (S), with the same dual-core processor featured in the iPad, an improved 8-megapixel camera, a major operating system update in iOS5, and Siri, a voice recognition “assistant” that makes calls, sends texts, and books calendar appointments among other things. Pre-orders begin October 7, with units available in-store Oct. 14. Watch video of the event here. (Apple)

* (CRM) CEO Marc Benioff’s appearance at Oracle OpenWorld was canceled, and Benioff blames Oracle CEO Larry Ellison. For its part, an Oracle (ORCL) spokesperson says the change was due to “overwhelming [event] attendance,” however speculation points to a difference of company philosophies turning into a feud. Never one to admit defeat, Benioff has instead set up an alternate venue at a San Francisco restaurant to speak. (All Things D and Marc Benioff via Facebook)

* Cult of Android claims that Kindle Fire pre-sales are well, on fire, pointing to supposedly leaked screenshots of Amazon’s (AMZN) internal inventory that show the color tablet is selling over 50,000 units a day. If that’s the case, then the company already has another hit on its hands. (Cult of Android)

* Napster, which was just purchased by Rhapsody, is laying off 120 employees Dec. 16. (GigaOm)

* IBM (IBM) is acquiring Q1 Labs, a security intel software company, for an unspecified amount and using it to form a security unit. (Between the Lines/ZDNET)

* According to Twitter Chief Revenue Officer Adam Bain, the “information network” now has 1,600 advertisers. (TechCrunch)

* U.S. mobile ad spending is expected to top $1 billion for the first time this year. (eMarketer)

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