wierd user accounts

[MobileCheese]

i noticed these user accounts on cuk what are they, they dont look normal

MSNBot Spider Viewing Archives
Book Ideas - Cooking For Left-Wing Vegetarians

20:12 Google Spider Viewing Thread
IT not worth it anymore?

 

[DaveB]

They are the automated scripts that google and MSN use to scan the page contents for indexing. There is a standard format for identifying them to site owners know what they are and can block them if they wish.