Well, UMDGEN v4 has been released.  UMDGEN is a great program for ripping and adding stuff into iso images, and also for saving isos in different formats.  Today, v4 has been realeased, and here's the changelog:

v4.00 changes:

* New layout
* UMDGen now displays information from UPDATEPARAM.SFO as well as PSP_GAMEPARAM.SFO
* Optimize button added. This function automatically detects and resizes dummy data, removed un-needed padding and dummies the contents of the UPDATE folder (if detected)
* Non-PSP standard images can be forced to be read by the user. Upon detection, UMDGen will let you know the image is non-standard and you can choose whether to continue and have UMDGen attempt to read it - *NOTE* depending on the individual image, this could cause UMDGen to close if it encounters data it isn?t expecting - but the general rule is if the PSP can read it then presume UMDGen can too.
* UMD_DATA.BIN file generator. If your compilation is missing this file then UMDGen gives you the oppertunity to create a new one.
* Ability to change ?PSP_SYSTEM_VER? in PARAM.SFO to different firmware version. (Use +/- key while version is selected)
* ?Drop Open? images re-introduced due to a lot of requests to re-add it to UMDGen.
* Complete CSO + DAX support. You can now edit compressed images the same as uncompressed images. Dax support now includes the use of Non-Compressed areas feature.
* ?Ezip? format removed. We didn?t think it was worth keeping this format since it only had very limited support anyway.
* ?Dummy File? option added as requested by many users.
* v3.50 still had trouble with one or two problem images. A lot of code to do with the reading/writing process has been restructured and these problems should now be fixed.