SharePoint web services

It's interesting how SharePoint Web Services works. Will add here useful links and my own comments based on my research.
Useful links:
Getting Started With SharePoint Web Services

The SharePoint web services are implemented in ASP.NET Web Services (ASMX), and you will find the physical files for most of these web services in the "Microsoft Shared" directory under "web server extensions\12\ISAPI" typically located at "C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\ISAPI". The admin web service for the Central Administration tool is located in the ADMISAPI folder for which the central administration console contains a virtual directory named "_vti_adm". When a SharePoint site is created it will contain a virtual directory named "_vti_bin" that points to this location. IIS does not contain any application or virtual directories for subwebs, they do however contain mapping to the _vti_bin virtual directory through SharePoint metadata and HttpModules.

Talk to SharePoint Through Its Web Services

List of SharePoint services includes the following:

WSS Web Services	Web Reference
Administration Service	http://server/_vti_adm/admin.asmx
Alerts Service	http://server/_vti_bin/alerts.asmx
Document Workspace Service	http://server/_vti_bin/dws.asmx
Forms Service	http://server/_vti_bin/forms.asmx
Imaging Service	http://server/_vti_bin/imaging.asmx
List Data Retrieval Service	http://server/_vti_bin/dspsts.asmx
Lists Service	http://server/_vti_bin/lists.asmx
Meetings Service	http://server/_vti_bin/meetings.asmx
Permissions Service	http://server/_vti_bin/permissions.asmx
Site Data Service	http://server/_vti_bin/sitedata.asmx
Site Service	http://server/_vti_bin/sites.asmx
Users and Groups Service	http://server/_vti_bin/usergroup.asmx
Versions Service	http://server/_vti_bin/versions.asmx
Views Service	http://server/_vti_bin/views.asmx
Web Part Pages Service	http://server/_vti_bin/webpartpages.asmx
Webs Service	http://server/_vti_bin/webs.asmx

MSDN