Below is the list of SharePoint URLs to get to commonly used administrative functions on a SharePoint site.This is a quick list for speedy reference as compared to tracking down links through the admin screens. All links in this list reference the English language directory (1033).
Add web parts to any page: append ?PageView=Shared&ToolPaneView=2
Create New Site Content: /_layouts/create.aspx
Create New Site: _layouts/NewsbWeb.aspx
List Template Gallery: _catalogs/lt/Forms/AllItems.aspx
Master Page Gallery: _catalogs/masterpage/Forms/AllItems.aspx
Manage your Alerts: _layouts/SubEdit.aspx
Create New Alert: _layouts/SubChoos.aspx
Manage Site Collection Administrators: /_layouts/mngsiteadmin.aspx
Manage Sites and Workspaces: /_layouts/mngsubwebs.aspx
Manage People: /_layouts/people.aspx
Manage User Permissions: /_layouts/user.aspx
Modify Navigation: /_layouts/AreaNavigationSettings.aspx
Modify Site Navigation: _layouts/SiteNavigationSettings.aspx
Recycle Bin: /_layouts/AdminRecycleBin.aspx
Site Directory: _layouts/SiteDirectorySettings.aspx
Save Site as Template: _layouts/savetmpl.aspx
Site Settings page: _layouts/settings.aspx
Create New Web Part Page: _layouts/spcf.aspx
Site Template Gallery : _catalogs/wt/Forms/Common.aspx
Site Column Gallery: /_layouts/mngfield.aspx
Site Content Types: /_layouts/mngctype.aspx
Site Content and Structure Manager: /_layouts/sitemanager.aspx
Site Usage Summary: /_layouts/SpUsageWeb.aspx
User Alerts: /_layouts/sitesubs.aspx
View All Site Content: /_layouts/viewlsts.aspx
Web Part Gallery: _catalogs/wp/Forms/AllItems.aspx
Web part maintenance mode: append ?contents=1 to the URL of the page
Open the page in Edit Mode: In Address bar, Type "javascript:MSOLayout_ToggleLayoutMode();"
or "javascript:MSOTlPn_ShowToolPane(’2′);" in the Address bar
Add Web Parts Pane: ?ToolPaneView=2
Manage List Template Gallery:/_catalogs/lt/Forms/AllItems.aspx
Manage Site Collection Users:/_layouts/1033/siteusrs.aspx
Manage Site Groups:/_layouts/1033/role.aspx
Manage Users:/_layouts/1033/user.aspx
Site Usage Report:/_layouts/1033/UsageDetails.aspx
Site Usage Summary:/_layouts/1033/Usage.aspx
User Information:/_layouts/1033/userinfo.aspx