Correct your interrupts as Henrik mentioned and I also noticed your T0count variable buried between the two interrupts and might be okay? but thought I'd point that out.

Code:
LED1   VAR  PORTD.0
LED2   VAR  PORTD.1

INCLUDE "DT_INTS-14.bas"     ' Base Interrupt System
INCLUDE "ReEnterPBP.bas"     ' Include if using PBP interrupts

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,  _ToggleLED1,   PBP,  yes
        INT_Handler   TMR0_INT,  _ToggleLED2,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor

    INT_ENABLE  TMR0_INT     ; enable Timer 0 interrupts
    INT_ENABLE  TMR1_INT     ; Enable Timer 1 Interrupts  
ENDASM

OPTION_REG = OPTION_REG & $80 | 1  ' Set TMR0 Prescaler to 256, leave RBPU alone

Main:
GOTO Main

'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1:
     TOGGLE LED1
@ INT_RETURN

'---[TMR0 - interrupt handler]-------------------------------(Blinky Light)------
T0Count  VAR WORD
ToggleLED2:
    T0Count = T0Count + 1
    IF T0Count = 512 THEN T0Count = 0 : TOGGLE LED2
@ INT_RETURN
Another thing to keep in mind; the timers need to be updated each time at the interrupt if it was preloaded with something other than default. Incomplete example:

Code:
T0H = $48       ' 1sec overflow value for TMR0
T0L = $E4

' After DT_INTS setup
T0CON = %00000111       ' TMR0 OFF and 1:256 prescaler. Bit7 ON/OFF
@   INT_ENABLE  TMR0_INT         ; Enable Timer 0 interrupts

Timer0:    
    TMR0H = T0H                 ' High byte loaded
    TMR0L = T0L                 ' Low byte loaded
    TMR0_OVF = TMR0_OVF + 1     ' Overflow increment counter       
    IF TMR0_OVF = TOT_0 THEN    ' Increment counter reaches TOT value
        'Do something
    ENDIF
@ INT_RETURN