"internet logs" folder - do you mean the Temporary Internet Files folder? If so, anything in that folder is safe to delete.
To clear the folder, in IE, click Tools, Internet Options, General tab, click Delete Files.
You can also change the setting for the size allowed. If you let the contents of the folder to get to 40MB, it partially defeats the purpose for having it, because it will take longer and longer to search through the folder for already downloaded files for a web page you've visited. On the same tab, click Settings, and change it to a smaller figure. I use 10MB, but it can be smaller or bigger.
All .tmp files are safe to delete, especially if they are more than a few days old.
If you're talking about a different folder, post back.