Don’t know why these two shortcuts (aswell as home and end buttons) stoped working in textmate after I upgraded to SL.

The solution (based on this post of the textmate blog) is simple: create and edit the DefaultKeyBinding.dic file:

    mkdir ~/Library/KeyBindings
cd ~/Library/KeyBindings
touch DefaultKeyBinding.dict
open -a TextMate DefaultKeyBinding.dict

Paste these bindings:

{
    /* home */
    "\UF729"  = "moveToBeginningOfLine:"; /* home */
    "@\UF702"  = "moveToBeginningOfLine:"; /* command + left arrow*/
    "$\UF729" = "moveToBeginningOfLineAndModifySelection:";
    "$@\UF702" = "moveToBeginningOfLineAndModifySelection:";

    /* end */
    "\UF72B"  = "moveToEndOfLine:";
    "@\UF703"  = "moveToEndOfLine:";
    "$\UF72B" = "moveToEndOfLineAndModifySelection:";
    "$@\UF703" = "moveToEndOfLineAndModifySelection:";

    /* page up/down */
    "\UF72C"  = "pageUp:";
    "\UF72D"  = "pageDown:";
}

Restart Textmate & enjoy : )