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Incomplete

Unsorted

Create a COM client (with early binding) (particularly with GCC/MinGW) (if possible under Winelib in linux is also interesting)
Provide a SOAP server function
Win interface... C++ calls to Fortran F90/95 Source Code ... and back...
Monte-carlo simulations

Task level

Retrieve bookmarks from Del.icio.us (Or anything else that demonstrates a HTTPS request with authentication)

Should be divided between HTTP-standard authentication and certificate-authenticated SSL. --Short Circuit 22:28, 6 December 2007 (MST)

Simple DB connection and queries.
Root finding
Numerical Integration (rectangle, trapezium, newton-cotes, runge-kutta, etc)

Is the formula hard coded or do we have to interpolate for integration and root finding? --Mwn3d

I'll throw together an algorithm for rectangle and trapezium. I'm not particularly familiar with newton-cotes, runge-kutta or any root-finding algorithm. --Short Circuit 22:28, 6 December 2007 (MST)

Create a new thread and execute it
Iterating over elements in a collection

See: Loop Structures... I know at least the Java category has a Collections example --mwn3d 23:36, 9 November 2007 (EST)

Variable-length Collection-type-specific examples (Java collections, C++/STL container classes, functional lists, etc.) would be worthwhile. --Short Circuit 22:28, 6 December 2007 (MST)

SAX. As well as DOM and XPath it would probably be useful to demonstrate parsing a simple XML document with SAX.
Sleep/pause the main thread
Closures
Monads
Merge sort
[hard] arbitrary precision integer and floating point math routines (these can be very instructive to new programmers)

Demonstrate use of math libraries like bignum for addition, subtraction, multiplication, division, sqrt. I realize the submitter was asking for an implementation, but they can check the library source for that.--Short Circuit 22:28, 6 December 2007 (MST)

Project level

Super Simple p2p network

Could be done with FIFOs for streams, and a constant number of clients. Needs to be more specific regarding what it does. --Short Circuit 22:28, 6 December 2007 (MST)

Writing a parser to parse structured text into appropriate native types. (A good demonstration format to parse might be JSON, though it should be about creating a parser rather handling JSON.)
[non-trivial] implement a table-based native code (macro?) assembler in various HLLs

Recently Completed

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On hold

Sounds Like Homework

These tasks may be interesting, but seem likely to be someone's homework. They should be put off until January. (Or the end of the next regular semester).

doubly-linked list algorithms, both cursor- and pointer-based implementations

Poor description

These may be too specific, or not specific enough.

Reading the file word by word using expect script