41.   Virtual advertising is the next new frontier in the marketing world.

42.   WebTV sees the hotel room as the next frontier in its quest to link TV viewers to the Internet.

43.   Where is the next frontier in exploration-art collecting?

44.   Who knows what creatures will inhabit the next frontier.

45.   With few development sites available elsewhere in Manhattan, builders and city officials view the far West Side as their next frontier.

46.   Child care is the next frontier we must face to enable people to succeed at home and at work.

47.   For malicious computer hackers and virus writers, the next frontier in mischief is the mobile phone.

48.   We may wonder where the next frontier really is.

49.   Monday, software giant Microsoft announced it was investing a billion dollars into online gaming, considered to be the next big frontier in the sector.