Forgive this naive question:
Of what use is the "bookmark a line" option in VS2008?

Please tell if you know any good programming practices in VS2008. To clarify I would like to give an example:
A Windows XP user should know what msconfig is, in order to optimize the performance of his OS. The following link mentions some XP tweaks:
http://reviews.cnet.com/4520-10165_7-5554402-1.html
Is there a similar link for VS2008?

Regards,