It really depends what king of logs... I mean, you can have many applications on your server, but there are different format of loggin used, so it's almost imposible to know what this and that means. I have this exampe in mind :
"Premature end of script headers" in apache logs, when some php or cgi script fails - this error message doesn't help much eh ?
I suggest that you just google whatever message you have doubts for, it would be more time effective.
The link from Yogesh seems pretty good