Change is inevitable
I was using perforce for the past 3 months and now I have to use Subversion at my new project
I have used subversion in the past but i started liking perforce due to its ease of use and simple commands
only pain was having to do a p4 edit on each file before editing it
I stumbled upon this nice article about Perforce to Subversion migration
Althougth the article is mainly about migrating code , it also talks about equivalent commands in perforce and subversion.
I found it really useful
Also theregister had a nice comparison