CentOS 5.5 Left Me Clueless and CentOS 5.5 USB Device Mounting Annoyance). But there is a far more critical (purely on the basis of desktop experience) bug that's some way associated with nash and mkinitrd packages.
The latest and greatest CentOS 5.5 is a pig while it comes to booting on our office desktops. It stays almost 20 sec at "Red Hat nash version 5.1.96 starting". After booting the systems are very smooth and one could see the advancements of v. 5.5 over 5.2 in terms of updated applications, kernel and other goodies.
Around 20 sec wait is a definite annoyance for any desktop user. To get a fix or workaround I browsed through CentOS and Red Hat forums and bugzilla only to end up at nowherelands. I suspected that the problem was associated with raid or selinux but the problem persisted even after disabling them both. There is a thread in CentOS forum, the poster has exactly the same problem though in CentOS 5.3. Even the bug was there in RHEL 5.3 as reflected in RH bug ID 499955. Version 5.4 (of both CentOS and RHEL) retained the bug. Even, Red Hat did not bother to fix or suggest a workaround to stop this annoyance boot delay in its latest version. From the discussion at RH bug ID 499955 it's clear that the annoyance doesn't get any priority from Red Hat developers. Seems this open source giant ignores Desktops - consumer or enterprise whatsoever. The spotlight for RH has always been server where such delay doesn't make a huge difference... Who's going to boot a dedicated server everyday!