Some of the experimental Firmwares release on samsung-firmwares.com change the default launcher to Helix Launcher. You may in fact be using helix rather than the default launcher. And just to clarify, you are not using a Galaxy Portal version of 2.1.
The name Portal is just that. A name. Depending on which region you are from the Portal is also called the Galaxy Spica and Galaxy Lite. The Model is all the same, though. The Samsung I5700.
If you downloaded a firmware from samsung-firmwares.com, you installed an experimental release for the Galaxy i5700.