Data from the NPD Group backs up in-store checks on Mac sales, according to Piper Jaffray. The analyst group notes that October figures are up 28 percent year-over-year; this is being attributed to release of new MacBooks on October 14th, which may have satiated many Mac followers who had been waiting for an upgrade. Piper is now estimating between 2.5 and 2.7 million Macs for the whole quarter,
