DTrace for GNU/Linux — SystemTap
One idea is in my mind. How can libmemusage.so, libmemintercept of memprof, memprof be merged into one and provide more and better results. E.g. sometimes you want to trace and get the profile when the heap maxes, or you want to have a histogram of allocations. It is possible to write C code for that and integrate it into one. On the other hand with technologies like DTrace one can easily write the histogram generation, profiling, etc with a trace script.
So what can we do on Linux? The thing coming closest to it is Systemtap. You write a trace script and the script gets compiled into a kernel module that is then loaded and is doing the probing. In theory one is able to even trace userspace with it.
The only problem is that SystemTap is not ready yet. To do really useful stuff one has to patch the Kernel with the utrace patch, Ubuntu/Debian are not featuring recent enough elfutils. So it will probably take another year until memprof can be a simple gui around SystemTap and such and probably two years until most distros come with a ready to use SystemTap.