We believe that your issue has been closed by the upload of
Version 1.139.1-1grml.01 of live-initramfs from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.8
Date: Mon, 01 Sep 2008 12:34:04 +0200
Source: live-initramfs
Binary: live-initramfs
Architecture: source all
Version: 1.139.1-1grml.01
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 live-initramfs - Debian Live initramfs hook
Changes: 
 live-initramfs (1.139.1-1grml.01) unstable; urgency=low
 .
   * Resync with Debian's 1.139.1-1 version.
     [Closes: issue497]
   * Drop debian/patches/03_fix_cow_tmpfs_mount.dpatch.
   * Drop debian/patches/04_get_rid_of_utillinux-mountbinary.dpatch.
   * Integrate debian/patches/03_grml_version_file_hook.dpatch.
   * Readd dpatch to build depends.
Checksums-Sha1: 
 ecf52462fa724181ad2271978a8971fe08a8fee8 1274 live-initramfs_1.139.1-1grml.01.dsc
 133df0883acf810adff72f97b716001c54867848 75646 live-initramfs_1.139.1.orig.tar.gz
 31ebe6e76f5fadd6d0a4833d42138b9d83da9fd9 10324 live-initramfs_1.139.1-1grml.01.diff.gz
 b18bcedf11991557bc958af6ba9eda61fdfb9191 70350 live-initramfs_1.139.1-1grml.01_all.deb
Checksums-Sha256: 
 72c61faf393ba7a0989892fcbd3d470e6c0cf7eef97eb6383d108f3be774fe36 1274 live-initramfs_1.139.1-1grml.01.dsc
 ca498b3643f5da465b3e2ae9b5af4b85559e40b133de75ad9d0ed818fd9316f8 75646 live-initramfs_1.139.1.orig.tar.gz
 28b7cf5c22a970931efd9bcf683d9bcc49f826046634be5c027d3ddc573a95c8 10324 live-initramfs_1.139.1-1grml.01.diff.gz
 81203d29b1420796427a0a4fc3ab9cbba8a897b1809fc767a1a5e85c5c1198ee 70350 live-initramfs_1.139.1-1grml.01_all.deb
Files: 
 7136720f662b753485a2e5e89cc07fa7 1274 misc optional live-initramfs_1.139.1-1grml.01.dsc
 4a5d3896047038942c04a7234f3e54a9 75646 misc optional live-initramfs_1.139.1.orig.tar.gz
 ea2ad449eceffb28810d069b3eb83711 10324 misc optional live-initramfs_1.139.1-1grml.01.diff.gz
 e7661041a49780671e2c08530145f9b1 70350 misc optional live-initramfs_1.139.1-1grml.01_all.deb

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Michael Prokop <mika@grml.org> has uploaded a package that may fix your bug.
Please test the package and inform the maintainer whether
version 0.92f.grml01 of initramfs-tools works as intended or not.

Thank you

The changelog is attached below

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Hash: SHA1

Format: 1.7
Date: Mon, 01 Sep 2008 10:57:08 +0200
Source: initramfs-tools
Binary: initramfs-tools
Architecture: source all
Version: 0.92f.grml01
Distribution: unstable
Urgency: low
Maintainer: Debian kernel team <debian-kernel@lists.debian.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 initramfs-tools - tools for generating an initramfs
Changes: 
 initramfs-tools (0.92f.grml01) unstable; urgency=low
 .
   * Apply patch to init to make sure we are using /bin/mount instead of
     mount which will use /root/bin/mount of the underlying root filesystem
     when using live-initramfs. [Testing: issue497]
Files: 
 bb537860bd0a8eb4941ce32e10a401c8 602 utils optional initramfs-tools_0.92f.grml01.dsc
 1932607faadc43f395dc68a1eee12050 65470 utils optional initramfs-tools_0.92f.grml01.tar.gz
 08752eb2df44081c8858d94998c282e9 72268 utils optional initramfs-tools_0.92f.grml01_all.deb

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JFTR: It's NOT just a cosmetic problem. Updates of udev and initramfs-tools 
packages will follow soon.

The serious problem about it is fixed by my current live-initramfs-grml-
versions, the cosmetic problem is in work-in-progress.

Current Debian/unstable has a serious problem in the boot chain:

  http://grml.org/screeni/gkrellShoot_08-07-20_164435.png

The "mount: you must specify the filesystem type" doesn't prevent current daily 
builds of grml from booting but /dev isn't fully featured. The problem is the 
lack of support for "mount -n -o move ..." in util-linux without specifying the 
filesystem (-t $FS), but util-linux lacks support for moving a tmpfs -> 
dependency hell. I'm in contact with maks (maintainer of initramfs-tools).

regards,
-mika-