the additional aliases are the ones i pick up from the threads i mentioned earlier, e.g. Answers.com, Britannica & others..
A9 $$1 |http://a9.com/?q=$$1
Answers.com $$1 |http://www.answers.com/main/ntquery?s=$$1
Britannica $$1 |http://www.britannica.com/search?query=$$1&ct=
Encarta $$1 |http://encarta.msn.com/encnet/refpages/search.aspx?q=$$1
Google Images $$1 |http://images.google.com/images?q=$$1
Google Microsoft $$1 |http://www.google.com/microsoft?hl=en&ie=ISO-8859-1&q=$$1
MobyGames $$1 |http://www.mobygames.com/search/quick?q=$$1
Omgili $$1 |http://omgili.com/omgili.search?q=$$1
Tucows $$1 |http://www.tucows.com/search?search=$$1
Yahoo Answers $$1 |http://answers.yahoo.com/search/search_result;_ylt=AgRBozjdbsrkgDkxb6e1zfcjzKIX?p=$$1
as for search folder aliases, you can add the 'Quick Launch' folder as some installers will place a shortcut there and myself throw a few shortcuts there..
%USERPROFILE%\Application Data\Microsoft\Internet Explorer\Quick Launch
btw, a suggestion, how about aliases & search folders in a separate ini file?