I've recently changed from cable ties to heavy duty velcro.
Cable ties are great, but it it can be a pain if you fiddle with your pedal board layout a lot (and I do...) You have to drill holes etc etc. On the plus side, they are dirt cheap, especially if you've got a budget hardware shop on a high street near you. And the pedals never move once they're lashed down.
Like most of the pedal-totin' Bassies out there, i've gone for heavy duty velcro. I used the normal stuff once - turned my pedal board on it's side for storage, went to use it at a gig and hey presto...untidy mess of cables, pedals and semi-sticky goo. The heavy duty is a bit more expensive, but nothing's shifted as yet.
Rushbo top tip...to make sure your FX dont move in storage or transit, put some foam or similar in the top of the case so it just rests on the pedals when closed. It helps to keep everything in place. I've found that the stuff you use as 'underlay' for laminate flooring works great, as you can add extra layers if you need to. And everyone's got a bit of spare laminate flooring underlay in the loft, right?