VibeAgent, a travel site with some social networking characteristics, has introduced a host of upgrades over the past few days.  None of them will blow your mind, but they represent nice extensions of the site’s existing features.

Nielsen//NetRatings has announced the leaders in three Web categories. Search, career development and multi-category travel have had high month- over- month visitor retention rates from June to July, but also had audience overlap with other competitors in their categories.