log entries

[Me - Atlantic]

Should these entries be a cause for concern? (from apache2/access.log

68.142.251.145 - - [27/Apr/2006:05:33:26 -0400] "GET /robots.txt
HTTP/1.0" 200 26 "-" "Mozilla/5.0 (compatible; Yahoo! Slurp;
http://help.yahoo.com/help/us/ysearch/slurp)"
202.63.45.196 - - [27/Apr/2006:05:47:12 -0400] "GET / HTTP/1.1" 200 1457
"-" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.13) Gecko/20060418
Firefox/1.0.8 (Ubuntu package 1.0.8)"
202.63.45.196 - - [27/Apr/2006:05:47:13 -0400] "GET /apache_pb.gif
HTTP/1.1" 200 2326 "http://www.mgjventures.com/" "Mozilla/5.0 (X11; U;
Linux i686; en-US; rv:1.7.13) Gecko/20060418 Firefox/1.0.8 (Ubuntu
package 1.0.8)"
202.63.45.196 - - [27/Apr/2006:05:47:13 -0400] "GET /favicon.ico
HTTP/1.1" 404 1085 "-" "Mozilla/5.0 (X11; U; Linux i686; en-US;
rv:1.7.13) Gecko/20060418 Firefox/1.0.8 (Ubuntu package 1.0.8)"
4.176.242.165 - - [27/Apr/2006:08:36:26 -0400] "GET / HTTP/1.1" 200 1457
"http://by113w.bay113.mail.live.com/mail/ApplicationMain_11.00.0005.0103.aspx?culture=&resxtest=&layout=&msgid=&to=&subject=&cc=&contactid=" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; Win 9x 4.90)"
4.176.242.165 - - [27/Apr/2006:08:36:27 -0400] "GET /apache_pb.gif
HTTP/1.1" 200 2326 "http://www.mgjventures.com/" "Mozilla/4.0
(compatible; MSIE 6.0; Windows 98; Win 9x 4.90)"
24.195.174.213 - - [27/Apr/2006:12:12:00 -0400] "GET / HTTP/1.1" 200
1457 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"
24.195.174.213 - - [27/Apr/2006:12:12:00 -0400] "GET /apache_pb.gif
HTTP/1.1" 200 2326 "http://mgjventures.com/" "Mozilla/4.0 (compatible;
MSIE 6.0; Windows NT 5.1; SV1)"
72.30.111.144 - - [27/Apr/2006:13:17:44 -0400] "GET /robots.txt
HTTP/1.0" 200 26 "-" "Mozilla/5.0 (compatible; Yahoo! Slurp;
http://help.yahoo.com/help/us/ysearch/slurp)"
221.228.250.117 - - [27/Apr/2006:20:11:20 -0400] "GET http://www.qq.com/
HTTP/1.1" 200 1457 "-" "Mozilla/4.0 (compatible; MSIE 4.01; Windows 98)"