Google Shares Hit New High  SAN FRANCISCO (Reuters) - Shares of newly public Google  Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GOOG.O target=/stocks/quickinfo/fullquote"&gt;GOOG.O&lt;/A&gt; on Tuesday hit a new high and posted  their  largest single-day percentage gain after five investment banks  issued bullish reports on the leading Web search provider.