For ISO creation (ripping from source media), as well as CD boot image extraction (useful when slipstreaming), I use IsoBuster, available here: http://www.isobuster.com/

For ISO mounting, I use SlySoft's Virtual CloneDrive, available here: http://www.slysoft.com/en/download.htm

For creating my own ISOs (not from a source CD/DVD), I have come to increasingly rely on a Windows Automated Installation Kit tool called OSCDIMG.exe.  This little gem can create ISOs of all kinds and flavors, and includes an option for creating a bootable ISO by including an extracted CD boot image.  It's quite fast and reliable, and can make ISOs out of WIM files with zero hassle.