"Turn off stereos, TVs, etc. before sending your Sim to bed and s/he will get a better night's sleep without the extra noise.." - TEM 

"When just starting out, you can use a free computer to search for a job.  To do this, buy a computer, look for work, and then return it that day.  If you do not see the job you want, do the same thing the next day." - TEM 

"If you have the Granny Raymond's Holiday Cookies object, set them out after your Sims got to sleep and Santa will visit your home.  You don't even need a fireplace!" - Kaibob 

"You can create a floating house in The Sims.  Build a lot of pillars and place flooring on the pillars.  Place your second-story walls and all other structural components.  After you are finished, switch to the ground floor and delete all of the pillars." - TEM 

"It is possible to have an indoor swimming pool in The Sims.  Delete a wall section in the room in which you want to place the pool (make sure it is an exterior wall).  Next place your pool since the game will now consider the room to be outside the house.  Restore the wall and you now have an indoor pool!" - TEM