is this google?

[stevelibby]

in my logs i have found the following
Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html)

is this google or someone using goole to crawl my site?

[ncw164x]

google does have that user agent but check the IP number it came from at arin.net

[Span]

This is Google's UA string:

Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

this is the one in your logs:

Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html)

That one has the spaces filled with a "+", so I would check the IP.