There is no way to tell which version the "current" nvidia driver is.
ProblemType: Bug
Architecture: amd64
Date: Sat Mar 20 23:39:25 2010
DistroRelease: Ubuntu 10.04
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
MachineType: Gigabyte Technology Co., Ltd. EP35-DS3L
NonfreeKernelModules: nvidia
Package: jockey-gtk 0.5.8-0ubuntu2
PackageArchitecture: all
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-16-generic root=UUID=c24ad57d-2bf6-4daa-aa40-231c3ce00056 ro quiet splash
ProcEnviron:
LANG=en_US.utf8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SourcePackage: jockey
Uname: Linux 2.6.32-16-generic x86_64
dmi.bios.date: 06/19/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F6
dmi.board.name: EP35-DS3L
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF6:bd06/19/2009:svnGigabyteTechnologyCo.,Ltd.:pnEP35-DS3L:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnEP35-DS3L:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: EP35-DS3L
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
Agree, asked myself a couple of times which version of nvidia driver do I use in order to post some bug reports. In other case the next version of nvidia will be also called current and it will be difficult to differ "old" current version from "new" current version.
You can see you driver version in NVIDIA X Server Setting or in Synaptic choused you installed driver.