I don't see anything spurious here, any suggestions as to what to look for? I see lots of soap requests from me and another user, oh wait it just did it again, i see:
2010-09-02 00:00:03,289 INFO [btpool0-10://www.mydomain.com:8080/service/soap/SearchRequest] [firstname.lastname@example.org;mid=7;ip=184.108.40.206;ua=ZimbraWebClient - IE8 (Win)/6.0.7_GA_2473.RHEL5;] soap - SearchRequest
2010-09-02 00:00:08,284 INFO [btpool0-10://localhost:7071/service/admin/soap/AuthRequest] [ip=127.0.0.1;] soap - AuthRequest
2010-09-02 00:00:08,428 INFO [btpool0-10://localhost:7071/service/admin/soap/GetAllServersRequest] [name=zimbra;ip=127.0.0.1;] soap - GetAllServersRequest
2010-09-02 00:00:25,519 INFO [MailboxPurge] [email@example.com;mid=7;] sqltrace - Slow execution (2301ms): DELETE FROM mboxgroup7.open_conversation WHERE mailbox_id = 7 AND conv_id IN ( SELECT id FROM mboxgroup7.mail_item AS mi WHERE mi.id = open_conversation.conv_id AND mi.mailbox_id = open_conversation.mailbox_id AND date < 1280721623)
2010-09-02 00:00:48,065 INFO [Timer-Zimbra]  SessionCache - Removed 2 idle sessions (SOAP, ADMIN). 3 active sessions remain.
2010-09-02 00:00:57,065 INFO [btpool0-12://mail.mydomain.com:8080/service/soap/SearchRequest] [firstname.lastname@example.org;mid=10;ip=220.127.116.11;ua=ZimbraWebClient - FF3.0 (Mac)/6.0.7_GA_2473.RHEL5;] soap - SearchRequest