I've compiled a list of what I think are humorous or interesting hotfixes that SP1 provides (some make you go "hmmm" while others really crack me up):
930618 You cannot access files on a memory card in a networked printer's built-in memory card reader, and you receive an error message in Windows Vista or in Windows XP SP2: "\\<IP_Address>\memory_card refers to a location that is unavailable"
930917 An optical disc appears to be blank after you format the disc by using the Live File System component on a Windows Vista-based computer
930261 You randomly receive a "Stop 0000000xA" error in Storport.sys when you start Windows Vista
933207 You may be unable to read from DVD-R DL or DVD+R DL discs that were recorded in Windows Vista
933272 The system time lags when you restart a Windows Vista-based computer that supports High Precision Event Timer
935606 Backup system files are not restored as expected when you use third-party system restore applications on a Windows Vista-based computer
936613 The performance of gaming graphics may be less than you expect, based on the Windows Experience Index score in Windows Vista
937426 You are prompted to activate Windows Vista after you start the system in diagnostic startup mode
938091 After you resolve an offline files synchronization conflict by using the "Keep both versions" option, the conflict occurs again on a Windows Vista-based computer
941025 When you press a keyboard button to start a program, there is a delay before the program starts on a portable computer that is running Windows Vista
941137 The EQUAL SIGN key does not work on a USB PC98 keyboard that is connected to a Windows Vista-based computer
941311 An Ultra DMA Mode 5 transfer mode may be listed as an Ultra DMA Mode 2 transfer mode in Windows Vista
931969 The Microsoft Software License Terms appear in the incorrect language when you try to view them in a program in Windows Vista
932406 The Windows desktop may stop updating correctly after a Windows Vista-based computer has been running for an extended period of time
934056 Error message when you try to print a picture from the Search window in Windows Vista: "Windows can't find this picture"
935415 The original file is overwritten when you select a file name from the history list in the Save As dialog box in Windows Vista
935855 Error message when you try to start Internet Explorer 7 in Windows Vista: "You must be an administrator to open Internet Explorer on this desktop"
943805 An item that you copy to a Windows Vista desktop does not appear on the desktop even though it appears in the Desktop folder
928387 Internet Explorer stops responding after you click a link on a Web site
932653 The pointer for a high performance mouse does not move correctly in Windows Vista
932988 Files from a Canon EOD 1D or 1DS camera may be corrupted after you use Windows Photo Gallery, Windows Live Photo Gallery, or Windows Explorer to edit the file metadata in Windows Vista or in Windows XP SP2
933006 A Web page is blank in Internet Explorer 7
933942 Error message when you restart a Windows Vista-based computer: "Windows Calendar has stopped working"
938724 An RTF document may be corrupted when it is opened in WordPad on a Windows Vista-based computer
942836 Stop error message when you try to print content that includes a bitmap on a Windows Vista-based computer: "Stop 0x00000001"
943544 The date displays incorrectly in the Windows Calendar Sidebar gadget on a Windows Vista-based computer
933433 Recording quality is poor when you use a USB microphone on a Windows Vista-based computer that has 4 GB of RAM or more
940059 Severe video degradation and a Stop error may occur on a Windows Vista-based computer when you connect a USB Webcam
930585 Uppercase letters “Ț” and “Ș” are displayed in the middle of words in the Romanian-language version of Windows Vista
932757 When you play a Windows Media High Definition Video DVD in Windows Media Center in Windows Vista, the video may not be synchronized with the audio
937188 When an Adobe RGB profile-embedded TIFF image is printed to the Windows XPS Document Writer on a Windows Vista-based computer or on a Windows XP SP2-based computer, the colors may be incorrect
935222 You cannot connect to a wireless network on a Windows Vista-based computer
939006 You cannot use Verizon FiOS products at their full speed on a Windows Vista-based computer
936686 Icons are missing from Control Panel, or you cannot start Control Panel, the Welcome Center, or games in Windows Vista
937063 The system automatically restarts when you try to encrypt files or to decrypt files by using EFS on a computer that is running Windows Vista
Here's my summary evaluation on SP1's speed:
Though these changes don’t individually seem like much, in aggregate, it makes a noticeable difference in the Vista experience. File management is now only inconveniently slow instead of agonizingly slow when compared to XP. Vista SP1 boots about 20% quicker and shuts down much faster too. There’s a lot less mindless disk thrashing during what should be idle periods. Even the Start Menu seems to respond faster.
I expect CPU to print even my "agonizingly slow" remark. Great rag, CPU. ;-)
-Llama