NET Compact Framework 2.0 Service Pack 1 details:

Added Features:

* Added support for WindowsCE 4.2 in both the CAB installation and a Platform Builder Update (For more information on the Platform Builder Update, see Windows CE Download Center.)
* Added the option to install the global assemblycache to the storage card.
* Allow DataGrid cell drawing to be overridden
* Added support for headless Windows CE 5.0 devices by adding a Headless catalog item in Platform Builder. (For more information on the Platform Builder Update, see Windows CE Download Center.)
* Added System SR files to the Windows CE 5.0 Platform Builder catalog item. (For more information on the Platform Builder Update, see Windows CE Download Center)
* Enabled device debugging using mdbg.
* Included LogViewer tools to monitor network traffic.
* Included the .NET Compact Framework Remote Performance Monitor. (For more information, see Steven Pratschner’s BLOG.)
* Added the Serializable attribute.

Fixed Issues:

* Changing VT_BYREF Variants in managed code could lead to a memory leak.
* Inappropriate caching of current UI culture even after CultureInfo.ClearCachedData is called.
* For the HttpWebRequest method, an uncatchable ObjectDisposedException could occur when exiting an application with asynchronous requests.
* Visual Studio hangs on setting a Breakpoint in a function with an infinite loop when it is called from the Immediate Window.
* Breakpoints do not work if the cached, managed dlls in the bcl directory differ from the ones on the device.
* Environment.GetFolderPath returns an InvalidOperationException.
* An access violation occurs when accessing .theControls or .Controls.Count property of a control once it has begun the disposing process.
* The WebBrowser.DocumentCompleted event is fired in a loop when the DocumentText property contains an image inside of a table.
* Files should be extracted to the main storage as a workaround to avoid hardware issues on some storage cards.
* For the HttpWebRequest method, an ArgumentOutOfRangeException occurs when accessing some https:// URLs.
* Timer breaks after GetTickCount wraps around (49.7 days).
* Error occurs when loading the .NET Compact Framework version 2.0 on a device using an ActiveSync push.
* Memory leaks occur when using Com marshaling.
* Installer should check for ActiveSync version and disable deployment if version is older than ActiveSync 4.0 build 4343.
* For the SerialPort class, an IOException is thrown when opening a serial port on the IPAQ 4150.
* A call to HttpWebRequest over SSL with a payload greater than 32 KB hangs on the client when SendChunked returns false.
* For the SerialPort class,an uncatchable exception occurs when Bluetooth is turned off.
* A finalizer for the FileStream class will cause the application to crash if a previous IO operation failed.
* Installation of the .NET Compact Framework fails on low memory devices.
* PInvoke return types of UIntPtr throw a NotSupportedException.
* The Debug.WriteLine method in the .NET Compact framework version 2.0 is not working.
* For the SerialPort class, virtual serial ports are not reported by the SerialPort.GetPortNames method.
* When using COM Interop, a VARIANT_BOOL type is passed incorrectly on ARMV4I.
* The .NET Compact Framework incorrectly performs version comparison when loading assemblies.
* ARMV4I runtime should be removed from ARMV4 Pocket PC CAB to reduce the size of the CAB.
* Corrections needed for Http Abort semantics.
* The DateTime.Now method throws an ArgumentOutOfRangeException.
* Crash caused by using CurrentTimeZone.GetDaylightTime and CurrentTimeZone.GetStandardTime in certain rare stress conditions.

So have a more pleasant development guys