Recently I had to go about setting up my own configurations for Webalizer. Grouping user-agents into meaningful sections seemed a worthwhile cause, so I ran through the mobile user-agent string list and setup matches for mobile devices on top of some of the more straightforward ones for desktop. The result is a pretty clean config that handles (in my experience) about 90% of my incoming traffic. I've also tried to provide a little bit of forward-planning for version numbers on some of the browsers which now update their major version almost daily (curse you, chrome), but you should plan to keep that aspect up to date yourself.
GroupAgent iPhone iPhone HideAgent iPhone GroupAgent iPad iPad HideAgent iPad GroupAgent Android Android HideAgent Android GroupAgent BlackBerry BlackBerry HideAgent BlackBerry GroupAgent PalmSource Palm OS HideAgent PalmSource GroupAgent SymbianOS SymbianOS HideAgent SymbianOS GroupAgent GoBrowser SymbianOS HideAgent GoBrowser GroupAgent Fennec Firefox Mobile (Fennec) HideAgent Fennec GroupAgent Maemo Firefox Mobile (Maemo) HideAgent Maemo GroupAgent Minimo Minimo HideAgent Minimo GroupAgent "Windows Phone" Internet Explorer (Windows Mobile) HideAgent "Windows Phone" GroupAgent "Windows CE" Internet Explorer (Windows Mobile) HideAgent "Windows CE" GroupAgent "uZard" Internet Explorer (Windows Mobile) HideAgent "uZard" GroupAgent Kindle Kindle HideAgent Kindle GroupAgent NetFront Kindle HideAgent NetFront GroupAgent "Opera Mini" Opera Mini HideAgent "Opera Mini" GroupAgent "Opera Mobi" Opera Mobile HideAgent "Opera Mobi" GroupAgent MOT Motorola Browser HideAgent MOT GroupAgent SEMC Sony Ericsson Browser HideAgent SEMC GroupAgent Firefox/21. 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GroupAgent Chrome/0 Chrome 0 HideAgent Chrome/0 GroupAgent Chrome Chrome HideAgent Chrome GroupAgent Version/7 Safari 7 HideAgent Version/7 GroupAgent Version/6 Safari 6 HideAgent Version/6 GroupAgent Version/5 Safari 5 HideAgent Version/5 GroupAgent Version/4 Safari 4 HideAgent Version/4 GroupAgent Version/3 Safari 3 HideAgent Version/3 GroupAgent Safari Safari HideAgent Safari GroupAgent Opera/20. Opera 20 HideAgent Opera/20. GroupAgent Opera/19. Opera 19 HideAgent Opera/19. GroupAgent Opera/18. Opera 18 HideAgent Opera/18. GroupAgent Opera/17. Opera 17 HideAgent Opera/17. GroupAgent Opera/16. Opera 16 HideAgent Opera/16. GroupAgent Opera/15. Opera 15 HideAgent Opera/15. GroupAgent Opera/14. Opera 14 HideAgent Opera/14. GroupAgent Opera/13. Opera 13 HideAgent Opera/13. GroupAgent Opera/12. Opera 12 HideAgent Opera/12. GroupAgent Opera/11. Opera 11 HideAgent Opera/11. GroupAgent Opera/10. Opera 10 HideAgent Opera/10. GroupAgent Opera/9. Opera 9 HideAgent Opera/9. GroupAgent Opera/8. 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GroupAgent MSIE Internet Explorer HideAgent MSIE GroupAgent PHP PHP-based script client HideAgent PHP GroupAgent php PHP-based script client HideAgent php GroupAgent Crawler Bot HideAgent Crawler GroupAgent crawler Bot HideAgent crawler GroupAgent Bot Bot HideAgent Bot GroupAgent bot Bot HideAgent bot GroupAgent Spider Bot HideAgent Spider GroupAgent spider Bot HideAgent spider