I think SMP fromcellphonesoft can be the same kind of "memory remedy" for the N97 as it was for the P990. Not to mention its several other uses.

Synopsis:

Swiss Manager Pro (SMP) is the unique application on the market that provides sufficient control over a Symbian smartphone for the advanced user. By manual and automated cleanup it is the only remedy for phones that suffer from frequent low memory problems.

In addition to memory and task management functions, SMP also provides extensive system information, and a fully fledged file manager. A composite system utility that indeed acts like the Swiss army knife for smartphones, considered as an essential addition by many users.

Swiss Manager Pro is compatible with all Symbian S60 smartphones by Nokia, Samsung, LG and Sony Ericsson, working equally well on keypad-based phones and on the latest touch-screen devices, like the Nokia N97 and X6, the Samsung i8910 (Omnia HD), and the SE Satio.

Major features:

- Task manager, system information, file navigator in one application.
- Full control over running and installed programs.
- Advanced memory cleanup functions to maximize free memory, both manually and automatically.
- Useful system information (device characteristics, system uptime, status reports, and much more).
- File manager providing fast and convenient operations (copy, move, delete, rename, etc.).
- Status icon displaying time, free memory, CPU usage, battery level, and drive usage.
- Floating menu for instant access to all major services.
- Fully customizable Favorite list for convenient application launch.
- Recent list providing automated access to the most frequently used programs.
- Key-press shortcuts for all major functions.
- Many options for full customization and convenient use.

Download it ! (Free trial)