CellTop is a new open-source app that Alltel recently launched for its mobile phones. CellTop is essentially widgets, called cells, for your cell phone, and is an Alltel exclusive. CellTop launched with 10 different cells, including my personal favorites, News Feeds and Weather.

The best part of this new app is that it is OPEN-SOURCE! Which will allow anyone to make their own cells. However, I’m assuming that it will have to be pushed through BREW/Qualcomm/Alltel first. Celltop is only available on one phone at the moment, the Samsung u520, but will soon be on the RAZR, KRZR, and the LG-AX245. Oh, and it is also FREE. The only charge you incur is when you refresh your cells, such as news or weather; it will count against your minutes, a whole 1 big minute to refresh your cells.

I purchased the Samsung u520 over the RAZR, specifically for the new CellTop app, however it comes packed with a ton of features that are very comparable to the RAZR. The Samsung also doubles as an Mp3 player with external control buttons, and an expansion slot for MicroSD memory cards. It has a ton of other features and it only cost a mere $50.00. (I’ll post a more in-depth review of the Samsung u520 later)

There are plenty of cells in the works, quite possibly a Digg.com feed and a Gmail cell.

I’ve become quite attached to CellTop, as I constantly find myself reading the news on my cell phone throughout the day. I look forward to hopefully a customizable RSS cell.

This is by far the coolest thing to hit cell phones, in my opinion.