<p>The initial public offering market, which went into a coma after Facebook's disastrous debut May 18, has sprung back to life.</p><p>In the first two weeks of October, 15 companies went public compared with 30 in the previous four months combined. No deals got done for more than a month after Facebook's IPO.</p><p>Nine companies went public last week, making it the busiest IPO week since the end of March.</p><p>The standouts were Workday, a Pleasanton company that sells human-resources software, and Realogy Holdings, which owns Century 21, Coldwell Banker, Sotheby's International and other real estate brokers.</p><p><a href="http://www.sfgate.com/business/article/IPOs-spring-back-after-Facebook-debut-3945744.php">Keep reading...</a></p>