Hey Seda, I agree. I naming convention saves my bacon. For what it's worth I use the following.
All assets start with the date e.g. 20140927. It doesn't matter what it is, a form, email, landing page, shared lists, the campaign even images or documents if they are specific to a campaign. They all start with the date. The date is more about a unique number than it is about the date specifically relating to the campaign. Except perhaps for an event, I use the date of the event as the unique number.
As an example, our newsletter is called Outside The Cube (You can subscribe here :-). So my naming convention is like this:
Campaign:
20140909 Outside the Cube 011
Emails:
20140909 CUSTOMER Outside the Cube 011
20140909 PROSPECT Outside the Cube 011
20140909 REM CUSTOMER Outside the Cube 011 (REM is "reminder" i.e. the email they get if they don't open the first one - that works a treat)
20140909 REM PROSPECT Outside the Cube 011
It means that I save assets etc in specific folders, but I rarely navigate through folders to find things, I just search for them in the search box, it's easy and saves time and because of the date I know I have the right asset associated with the right campaign.
This is just one option, I'm sure there are many ways. I hope this helps.
Cheers
Derek