WJ Communications ( WJCI) saw its shares jump 21% a day after the company said fourth-quarter revenue exceeded its own estimates. The maker of radio-frequency semiconductor products said revenue of $11.7 million rose 48% from the year-ago fourth quarter and topped its guidance range of $10 million to $10.5 million. WJ lost $2.1 million, or 3 cents a share, for the fourth quarter, compared with a loss of $4 million and 7 cents a share in the same quarter last year. Shares of WJ were higher by 45 cents at $2.62. Intersections ( INTX), a provider of credit management and identity-theft detection services, surged 12% a day after Jim Cramer mentioned the stock positively on his "Mad Money" TV show . Intersections was gaining $1.11 to $10.21. eDiets.com ( DIET) said revenue for the fourth quarter totaled $12.1 million, an 8.5% increase from the same period last year. The company swung to a profit, posting net income of $1.5 million, or 7 cents a share, compared with a loss of $100,000, or less than a penny a share, last year. For 2006, eDiets.com is projecting an 8% to 10% revenue increase and decreased ad spending relative to last year. After noncash stock-based compensation expenses, eDiets.com expects to at least double its earnings per share this year vs. 2005. First-quarter revenue should grow 4% to 6%, while eDiets is forecasting a reduced operating loss. Even with the improvements, shares of eDiets sank $2.17, or 27.3%, to $5.79. Sirenza Microdevices ( SMDI), a supplier of radio-frequency components, was gaining nearly 14% following news the company had lifted its guidance for the first quarter. Sirenza expects revenue of $20 million to $21 million and earnings, before items, of 7 cents to 9 cents a share. The company previously forecast revenue of $17.5 million to $19 million and earnings of 5 cents to 7 cents a share before items. Sirenza's shares were up $1.02 to $8.46.