Ctrl+L Jump to Line Number. To hide/show line numbers, press ctrl+F10 and select 'Show Line Numbers'
There is no way to go to a particular column according to my knowledge.
As you are aware CTRL+L goes to a particular Line, there is also CTRL+Q to go to the last edit location. The is no key combination in Eclipse to go to a particular Line and Column.
You can use a Keyboard Macro (available as hardware in some keyboards and included as software with some other keyboards). An explanation for Microsoft is here: http://support.microsoft.com/kb/237179 .
You can use CTRL + forward or backward key to jump to the next dot in the same line.
for example, in System.out.println("test"); you can switch between System, out and println by using CTRL + forward and backward key.