L_Menu_BaseUrl: javascript variable that holds the url of the current web site

http://www.sharepointdevwiki.com

The previous instance of the timer job 'jobid, id for service  is still running, so the current instance will be skipped.  Consider increasing the interval between jobs. 

You can resolve Job name from the Id:
Open Central Administration / Operations / Timer Job Definitions
Move mouse over Job's title and you can see id on the status bar (?JobId=..)

You can get current schedule: (Default 15sec)
stsadm -o getproperty -pn job-config-refresh

Change schedule:
stsadm -o setproperty -pn job-config-refresh -pv "Every 4 minutes between 0 and 59"

Also you can try to rebuild config cache:
http://blogs.msdn.com/josrod/archive/2007/12/12/clear-the-sharepoint-configuration-cache-for-timer-job-and-psconfig-errors.aspx

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TaxonomyClientService

http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.taxonomy.webservices.taxonomyclientservice(v=office.14).aspx

http://social.technet.microsoft.com/Forums/en/sharepoint2010programming/thread/bdfd4d7c-279c-4b6e-b098-52097b2c058a

http://msdn.microsoft.com/en-us/library/dd905976(v=office.12).aspx