In the effort to gathers together some piece here and there about QT and Maya.
I keep this page as shortcut insteed of going everywhere to retrieve the information.
4-combo box (under containers group) ——————Maya command to access————> optionMenu;
5-line edit (under input widgets group) ——————-Maya command to access————> textField;
6-spin box (under input widgets group) ——————Maya command to access————> NONE
7-double spine box (under input widgets group)———Maya command to access————> NONE
8-dial (under input widgets group) ————————Maya command to access————> NONE
9-list view (under item views model based) ————–Maya command to access————> textScrollList;
10-horizontal slider (under input widgets) —————-Maya command to access————> intSlider;
11-label (under display widgets group) ——————-Maya command to access————> NONE
12-progress bar (under display widgets group) ———-Maya command to access————> progressBar;
13-vertical slider (under input widgets) ——————-Maya command to access————> intSlider;
14-horizontal line (under input widgets) ——————Maya command to access————> NONE
15-vertical line (under input widgets) ———————Maya command to access————> NONE
16-group box (under containers group) ——————Maya command to access————> NONE
17-tab widget (under container group) ——————-Maya command to access————> tabLayout
18-main window ——————————————–Maya command to access————> window;proc foldr()

Original post: http://area.autodesk.com/blogs/stevenr/maya_2011_highlight_qt_user_interface
For docking
import maya.cmds as cmds
dialog = cmds.loadUI(uiFile=’C:usersmayauijd_charUIjd_animationTool.ui’)
allowedAreas = ['right', 'left', 'all']
docker = cmds.dockControl( area=’left’, content=dialog, allowedArea=allowedAreas, width=250 )