OP, the things you are mentioning are custom partitions. Basically, your phone shipped with 512mb of internal storage. More than half is dedicated to housing your operating system, roughly 150mb is actually usable by you (for apps). Owners of GSM phones can flash "custom hboots" (custom partitions) to free up more room for apps. They can do that when they flash ROMS that require less than the 240mb the stock Sense rom requires. Any rom that fits on the (huge) stock partition, will fit on the smaller custom ones.
Your phone is CDMA. If you try to flash an hboot you will brick your phone about as hard as you possibly can. If you don't have a goldcard made (or have the EXACT RUU for your provider, your phone will be worthless.
I repeat, do NOT touch hboots. ANY rom you can find, including Runnymede, will fit on the stock hboot. Just partition 1gb of your external SD card to EXT3 or EXT4 file system.
@Bossonline, I don't know what to tell you. Sounds like there's some weird restriction on MAC addresses. In the US you can just fire up your phone and connect to your wifi and never activate it (as a matter of fact, that's what I do with mine. Use it as a baller iPod touch).