Apple shares reached a ten-week high on trading yesterday, closing at $67.96 (up $2.37).

The company shone on an otherwise depressed Nasdaq index, as investors considered yesterday's Banc of America Securities upgrade on the stock.

Analysts at Banc of America Securities issued a new 'Buy' rating on Apple's stock, pointing to continued strong demand for MacBooks and iPods and predicting an iPod phone "by 2007". They offered a new $79 target price on the shares, up from $68.

The news also drove a surge in trading on companies connected to Apple's iPod ecosystem, Wolfson Microelectronics, for example.

That Scottish firm provides digital audio chips for iPods (and other devices). The firm shot to the head of the FTSE 250 riser's table as investors placed their bets that any new iPod releases from Apple would propel Wolfson's fortunes.

Wolfson shares climbed £0.21.25, closing at £4.52 per share.