While playing, press [CTRL] + [SHIFT] + C, then type the following codes:

Code      Result 
klapaucius - $1000 Simoleons 
water_tool - Make your home an island surrounded by water 
set_hour # - Change time of day to # (1-24) 
set_speed #  - Game speed to # (-1000 to +1000) 
interests - View personality and interests of your Sims 
autonomy # - Change how Sims think on their own (1-100) 
grow_grass # - Grow grass # (1-150) 
map_edit on/off - Edit the map 
route_balloons on/off - Basic tutorial on/off 
sweep on/off - Shows ticks of the game 
tile_info on/off - Show or hide tile info 
log_mask - Set event logging mask 
draw_all_frames on/off - Draw all frames on and off 
history - Dumps family history file 
edit_char - Open Create-A-Character screen 
lot_size # - Change lot size to # 
! Repeat - last cheat 
; Separate - multiple cheat commands 
 

Paying the Bills
Simply keep a bill, unpaid, until the mail carrier delivers the next set. When your flag is up (your mailbox being full of-- what else, more bills), pay the first one (i.e., bring it out to the mailbox.) When you do this, the newer bills disappear. Using this cheat, you will only have to pay every other bill, instead of every one. 

Garbage Bag of Holding
In the early stages of The Sims life time is often wasted emptying the trash and bringing it to the curb. I found that if you fill the cheap 30 simolian trash barrel you can order your sim to empty it and just as they remove the bag cancel the order. Then order them to pick up the mess that they just made and they will return the full bag to an empty barrel, which will now be empty. Do this every time it fills and trash need never be brought outside to the curb again. This saves a lot of time. 

Fast Money
Bring up cheat mode and enter the "klapaucius" code. The bring up cheat mode again and enter "!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;!:!;!" (you may add up to 60 total).