The Adobe CS4 suite is coming, but you can download the PC and Mac trials today! You will require an Adobe ID (free) to do this:

Update 2: Adobe has officially released the trials so just head over to the Trial Center and download them.

Update: Looks like Adobe has caught wind of this and their FAQ says they will be available again in mid-November. You can still find the trials via torrents but I will update with working links as they are available.

Mac

1. Go to Adobe's Trial Center and login (register for a free acount if you don't have one).
2. Copy and paste this direct address to download the CS4 Master Collection .dmg (6.9GB):
   http://trials.adobe.com/Applications/MastCol/CS4/Mac/ADBESTAMCS4_LS1.dmg
3. Watch a movie or two until it's done!

Windows

(Credit goes to Daniel in the comments)

HOW TO DOWNLOAD ANY CS4 PRODUCT TRIAL OFF ADOBE.COM:
1. Log in to adobe.com - 
2. Go to adobe.com/downloads
3. Select Photosohp Lightroom (don't have to download it)
4. Inject these codes into Firefox address bar and download!

http://trials.adobe.com/dlm/Applicat...oneyouwanthere

Official trial codes:

-Master Collection
MastCol/CS4/Win/ADBESTAMCS4_LS1.exe
MastCol/CS4/Win/ADBESTAMCS4_LS1.7z

-Design Premium
DesignPre/CS4/Win/ADBESTDSCS4_LS1.exe
DesignPre/CS4/Win/ADBESTDSCS4_LS1.7z

-Web Premium
WebPre/CS4/Win/ADBESTWDCS4_LS1.exe
WebPre/CS4/Win/ADBESTWDCS4_LS1.7z

-Photoshop CS4
Photoshop/CS4/Win/ADBEPHSPCS4_LS1.exe
Photoshop/CS4/Win/ADBEPHSPCS4_LS1.7z

-Illustrator CS4
Illustrator/CS4/Win/ADBEILSTCS4_LS1.exe
Illustrator/CS4/Win/ADBEILSTCS4_LS1.7z

-InDesign CS4
InDesign/CS4/Win/ADBEIDSNCS4_LS1.exe
InDesign/CS4/Win/ADBEIDSNCS4_LS1.7z

-InCopy CS4
InCopy/CS4/Win/ADBEAICYCS4_LS1.7z
InCopy/CS4/Win/ADBEAICYCS4_LS1.exe

-Fireworks CS4
Fireworks/CS4/Win/ADBEFWKSCS4_LS1.exe
Fireworks/CS4/Win/ADBEFWKSCS4_LS1.7z

-After Effects CS4
AfterEffects/CS4/Win/ADBEAFETCS4_LS7.7z
AfterEffects/CS4/Win/ADBEAFETCS4_LS7.exe

-PremierePro CS4
PremierePro/CS4/Win/ADBEPPROCS4_LS7.7z
PremierePro/CS4/Win/ADBEPPROCS4_LS7.exe

-Dreamweaver CS4
Dreamweaver/CS4/Win/ADBEDRWVCS4_LS1.exe
Dreamweaver/CS4/Win/ADBEDRWVCS4_LS1.7z

-After Effects Content
AfterEffects/CS4/Win/ADBEAFETCS4_Cont_LS7.exe
AfterEffects/CS4/Win/ADBEAFETCS4_Cont_LS7.7z

-Premiere Content
PremierePro/CS4/Win/ADBEPPROCS4_Cont_LS7.exe
PremierePro/CS4/Win/ADBEPPROCS4_Cont_LS7.7z

-Photoshop Extended Content
Photoshop/CS4/Win/PHSPCS4_Cont_LS1.exe
Photoshop/CS4/Win/PHSPCS4_Cont_LS1.7z