In more merger-related tech news, CNET ( CNET) agreed to sell itself to CBS ( CBS) for $1.8 billion. CNET shares have soared nearly 50% since Monday, and CBS surrendered 4%. Elsewhere, activist investor Carl Icahn built up his position in Yahoo! ( YHOO) before moving to replace 10 of the company's directors, saying in a letter that the firm "acted irrationally" in turning down Microsoft's ( MSFT) sweetened buyout bid. Yahoo! shares have ballooned 6.7% over the past week. The Internet HOLDRs ( HHH) fund jumped 4.7%, and the Internet Architecture HOLDRs ( IAH) ratcheted up 2.5%.