Like Jim's office scenario, we operate a 'virtual office' and first trialed remote work about 5-6 years ago when a staff member in my previous practice had to relocate overseas. It's now used with "staff" around the country and works really well.
Dropbox is used primarily for file sharing and each member creates their own free account to upload files and email the download links along with any message or other written information as part of a standard email. This allows email file sizes to be kept to a minimum as only the download link is sent and they're also less likely to get caught up in virus filters as they don't include attachments. It also maintains a better level of QA as all the files (AEC, DLF, PAK, PDF, photos, renders, reports etc.) can be stored in the Dropbox project folders as a secondary backup to what each person has on their own PC. Selected download files/links can also be emailed to clients, consultants contractors and others involved in a project as required without the need to attach and send emails to different groups but with the same or similar information. I can also access this information if I'm out of the office.
The design and coordination is all done in my office and I initially send out a PAK file and PDF set to get the other's started as this allows each user to 'rebuild' the file and all attachments (xrefs, images etc.) at their end. After they have the starting file which would include the site survey file(s) so everyone is working from the same location, most subsequent files I send out are individual (DLF) or group layer files (Layerset - includes MSP and/or GTV). This eliminates any accidental overwriting of the master file(s) which are at my end with each user working on various portions of the project that I require them to work on - building sections, RCP's, 3D modelling, construction details etc. If I've asked a member to progress on say a building section using layers (a, b, c etc.) then I lock those layers at my end so I know not to do any work on them until I receive the updated layers from the other user(s). This eliminates work being overwritten.
They then email back a dropbox link of their DLF's (zipped) which I then place into a folder for the particular member, then do a drawing file purge on my current master file and then work on the purged file (numerical or alphabetical revision depending on SD or CD phase) . This allows a progressive series of master files which become backups in their own right. I then toggle to the first layer they have sent through and using Layer/Import/Replace, the layer is automatically updated with their work. I then toggle to the next layer they sent through and repeat until all the layers have been replaced with the newer drawing info they've emailed me. Usually they work on about half a dozen layers at a time with the updating only taking a few minutes. DataCAD also allows layers to be viewed prior to loading so this can sometimes be a useful feature to pre-check work before importing.
The benefit of this method is, it isn't essential they replicate the exact file structure I have at my end. I've 3 hard disk's in my workstation and most other's only have 1 or 2 so the drive letters don't match. I do stipulate the print drivers, pen tables, default files and the latest DataCAD version etc. are all the same but short of them buying extra hardware to mimic my system setup, the exchange of layers has proven to be an efficient and simple method of updating drawings allowing the project lead to maintain the master DataCAD files, including xrefs etc., essentially allowing one person to drive the project with the support team providing a continual supply of updates (layers) as the project advances. The outgoing emails with download links also become a record of work I request to be done and helps me focus on what is needed as I prepare the emails and I've found gives clear instruction to each member on what they need to work on. On one project some years ago, I'd be sending out the email just before COB, then arrive to the office in the morning with a reply email and dropbox links from the member who was on the other side of the world, essentially turning the process into a 24 hour workflow.
There's other techniques that have been applied but the exchange of layers using DataCAD's automatic import/replace feature keeps everything simple and there is an ongoing archive of layers from each user that are available if I accidentally erase something and only discover it much later on.