Console cheats
During the game, hit tilde (~) to bring up the console. 
Now type player-> followed by any of the following codes: 

Result - Code 
Toggle God mode - togglegodmode -or- tgm 
Walk on water - setwaterwalking 1 
Flight mode - setflying 1 
Super jumps - setsuperjump 1 
Breathe underwater - setwaterbreathing 1 
Set Stat/Skill - set [stat/skill] [number] 
Set maximum fatigue value - setfatigue [number] 
Add indicated amount of gold - additem "Gold_100" [number] 
Set maximum magic value - setmagicka [number] 
Place character in the named cell - centeroncell -or- coc [cell ID] 
Set player health - sethealth [number] 
Add all entries to journal - filljournal 
Place character in exterior cell grid - centeronexterior -or- coe [x,y] 
Show all the towns on full map - fillmap 
Teleport 128 units from location - fixme 
Get faction reaction - getfactionreaction [faction ID] 
Create map image file for Xbox - createmaps [\"filename.esp\"] 
Show help commands - help 
Show variables - showvars -or- sv 
Stop cell test - stopcelltest -or- sct 
Toggle AI - toggleai -or- ta 
Toggle collisions - togglecollision -or- tcl 
Toggle debug text - toggledebugtext -or- tdt 
Toggle dialogue statistics - toggledialoguestats -or- tds 
Toggle fog of war - togglefogofwar -or- tfow 
Toggle menus - togglemenus -or- tm 
Toggle scripts - togglescripts 
Toggle stats - togglestats -or- tst 
Toggle sky - togglesky -or- ts 
Toggle texture string - toggletexturestring -or- tts 
Toggle wireframe - togglewireframe -or- twf 
Toggle water/no water - twa 
Toggle vanity mode - tvm 
Toggle grid - togglegrid -or- tg 
Toggle kill statistics - togglekillstats -or- tks 
Toggle load fade - toggleloadfade 
Toggle magic statistics - togglemagicstats -or- tms 
Toggle script output - tso 
Toggle bot AI - tai 
Show variables - sv 
Show animations - sa 
Reset enemies, NPCs, players - ra 
Toggle lighting - tl