Filtered Lookup in MS CRM 4.0

MS CRM 4.0 does not provide filtered lookup facility, but we have some couple of options that we can use to implement filtered lookup in ms crm 4.0 like

1.Change lookupsingle.aspx page
http://crm.georged.id.au/post/2008/02/16/Filtering-lookup-data-in-CRM-4.aspx

2. Buy stunware filtered lookup tool

http://www.stunnware.com/default.aspx?area=products&group=fld4&subarea=fld4-download

3. Using JS Code

http://advantageworks.blogspot.com/2008/02/pseudo-filtered-lookup-dialog-in.html

4. Writing plugin.

http://mscrmfilteredlookup.codeplex.com/

Have fun
Sudhanshu