Unfortunately, it doesn't matter what the Verizon officials say, it matters what your actual contract says.
Basically, there is a 5GB cap... it's possibly a "soft-cap"... there may be some wiggle room. Or not. Verizon's position is that, if you're using the phone as intended, doing entirely legal things, it'll be wholly impossible to exceed 5GB per month. Thus, if you are exceeding 5GB per month, you must clearly be doing something that's not permitted. So it's unlimited, but capped at 5GB.
I'm surprised there's any contraversy, other than Verizon saying "unlimited" and actually meaning 5GB... but then again, so do AT&T, Sprint, and T-Mobile. And despite the inclusion of things like a YouTube application,
video streaming is technically not allowed. If you did 6 hours of HD video on YouTube (assuming the DROID actually gets served YouTube's "HD", which is 720p at 2Mb/s), you'd blow your 5GB limit (anyone wanting to experiment, please post the results).
Here's what the contract actually says:
Data Plans and Features (such as NationalAccess, BroadbandAccess, GlobalAccess, Push to Talk, and certain VZEmail services) may ONLY be used with wireless devices for the following purposes: (i) Internet browsing; (ii) email; and (iii) intranet access (including access to corporate intranets, email, and individual productivity applications like customer relationship management, sales force, and field service automation). The Data Plans and Features MAY NOT be used for any other purpose. Examples of prohibited uses include, without limitation, the following: (i) continuous uploading, downloading or streaming of audio or video programming or games; (ii) server devices or host computer applications, including, but not limited to, Web camera posts or broadcasts, automatic data feeds, automated machine-to-machine connections or peer-to-peer (P2P) file sharing; or (iii) as a substitute or backup for private lines or dedicated data connections. This means, by way of example only, that checking email, surfing the Internet, downloading legally acquired songs, and/or visiting corporate intranets is permitted, but downloading movies using P2P file sharing services and/or redirecting television signals for viewing on laptops is prohibited. A person engaged in prohibited uses, continuously for one hour, could typically use 100 to 200 MBs, or, if engaged in prohibited uses for 10 hours a day, 7 days a week, could use more than 5 GBs in a month.
For individual use only and not for resale. We reserve the right to protect our network from harm, which may impact legitimate data flows. We reserve the right to limit throughput or amount of data transferred, and to deny or terminate service, without notice, to anyone we believe is using an Data Plan or Feature in any manner prohibited above or whose usage adversely impacts our network or service levels. Anyone using more than 5 GB per line in a given month is presumed to be using the service in a manner prohibited above, and we reserve the right to immediately terminate the service of any such person without notice. We also reserve the right to terminate service upon expiration of Customer Agreement term.